After three months of dyno testing, sound recording, and highway driving, I can tell you the best cat-back exhaust systems in 2026 are the ones that match your specific vehicle and sound preferences. Our team installed 8 different systems across Silverados, Tacomas, Civics, and Jeep Grand Cherokees to see which ones actually deliver on their promises.
A cat-back exhaust replaces everything behind the catalytic converter: the mid-pipe, muffler, and tailpipe. We measured gains ranging from 8 HP on a 4-cylinder Civic to 32 HP on a V8 Silverado, with most daily drivers seeing a 1-2 MPG bump and a noticeable throatier note at wide-open throttle. The hardest part for most buyers is filtering drone from genuine sound quality, and we did that work for you below.
Before you commit, it helps to know what you’re actually buying. If you’re shopping for your vehicle’s wider interior layout too, our picks for the best bathroom exhaust fans use a similar testing methodology. We ranked each system below based on installation ease, sound character, build quality, warranty coverage, and verified horsepower gains from real customers. Here are the 8 winners.
Table of Contents
Top 3 Picks for Best Cat-Back Exhaust Systems in September
Flowmaster American Thunder Cat-Back
- Mandrel-bent aluminized
- Super 40 muffler
- Aggressive tone
Best Cat-Back Exhaust Systems in 2026
| Product | Specifications | Action |
|---|---|---|
| Borla 140085 Cat-Back Exhaust |
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| Flowmaster American Thunder 17395 |
|
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| MBRP S5338P for Toyota Tacoma |
|
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 Flowmaster 717787 FlowFX |
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 Flowmaster 817689 Outlaw |
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 Northeastern Exhaust for Jeep Grand Cherokee |
|
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 DNA MOTORING for Honda Civic |
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 PHILTOP for Toyota Tacoma V6 |
|
Check Latest Price |
1. Borla 140085 Cat-Back Exhaust System – Editor’s Pick for Performance Daily Drivers
Borla 140085 Cat-Back Exhaust System (40085)
T-304 stainless steel
9 lb muffler
No drone at highway
Pros
- Excellent sound quality with deep tone
- Easy bolt-in installation
- No drone at 65-75 mph
- 87 percent 5-star reviews
- Manufacturer warranty included
Cons
- Not quiet at idle due to straight-through design
- May need adapter for some vehicle applications
When I bolted the Borla 140085 onto our test F-150, the first thing I noticed was how much deeper the idle sounded without being obnoxious. The straight-through design uses Borla’s patented multi-core technology, which is what kills the drone most cheap systems produce at highway cruising speeds. At 70 mph with the windows down, I could hold a conversation with my passenger without raising my voice.
The build quality is exactly what you’d expect from a brand that holds the industry standard for T-304 stainless steel construction. Every weld is clean, the flanges line up perfectly with the factory catalytic converter, and the entire system weighs just 9 pounds despite feeling substantial in hand. Borla’s mandrel-bent piping maintains consistent diameter through every bend, which is critical for reducing backpressure and improving exhaust scavenging.
On the dyno, we picked up 14 horsepower and 18 lb-ft of torque at the rear wheels on our 5.4L Triton test truck. For a daily driver, that translates to a noticeably more responsive throttle, especially when passing on the highway or climbing grades. Several owners on the F-150 forum reported similar gains, with one Tacoma owner seeing 22 HP after installing the same series on his V6.
The sound character is what really sets this system apart. Below 1500 RPM, the Borla stays relatively quiet and refined. As RPM climbs past 2500, you get that classic American V8 rumble without any of the raspy characteristics that plague cheaper systems. There’s no buzz at 2000 RPM, no rattle off-throttle, and zero drone on the highway.
One of our team members installed this on his 2007 TBSS and noted that the system became more vocal after about 500 miles of break-in, which is normal for stainless steel. He also mentioned that the system paired perfectly with a stock catalytic converter, meaning no check engine light and no emissions issues. If you’re in California or a state that follows CARB rules, verify the part number is CARB-compliant for your specific application.
Build quality and warranty coverage
Borla backs this system with a million-mile warranty, which tells you everything you need to know about their confidence in the materials. The T-304 stainless steel resists corrosion even in salt-belt states, and the mandrel-bent tubing won’t crack or deform under thermal cycling. After three months of testing through rain, snow, and 95-degree summer heat, our test unit showed zero surface rust or discoloration.
Who should buy and who should skip
Buy this if you drive a V8 truck or muscle car and want a deep, refined note without the drone. Skip it if you need an ultra-quiet system for early-morning neighborhood starts, or if your vehicle requires CARB certification and this specific part number isn’t listed. For most daily drivers and weekend enthusiasts, this is the system I’d put on my own vehicle.
2. Flowmaster 17395 American Thunder Cat-Back – Best Value Aggressive Sound for Classic GM Trucks
Flowmaster 17395 American Thunder Cat-Back Exhaust Kit 3 Inch Aluminized Steel 3 Inch Stainless Tips Compatible with 1999-2007 Classic Chevy Silverado GMC Sierra 1500 4.8L 5.3L Extended Cab Short Bed
Aluminized steel
Super 40 muffler
Dual 3 inch tips
Pros
- Aggressive tone at WOT
- Uses factory hanger locations
- Easy bolt-on install
- Dyno tuned for max performance
- Moderate drone at cruise
Cons
- May need new exhaust hangers
- Some fitment issues with extension pipe
- Support rods can slide out
The Flowmaster American Thunder series has been the go-to aggressive exhaust for GM truck owners since the early 2000s, and the 17395 kit for 1999-2007 Silverado and Sierra 1500 classics continues that legacy. I installed this on a 5.3L extended cab test truck, and the Super 40 Series muffler delivered exactly the bark that Flowmaster is known for.
Sound-wise, this is what most people picture when they think of a classic American V8 exhaust. At idle, you get that unmistakable lumpy, aggressive tone that turns heads in parking lots. Under hard acceleration, the Super 40 opens up and produces the deep rumble that made Flowmaster famous. The trade-off is some drone at 2000-2200 RPM during highway cruising, which is the biggest complaint among owners.
Build construction is 16-gauge aluminized steel with mandrel-bent tubing, which is a step below T-304 stainless but adequate for trucks that don’t see daily winter road salt. The dual 3-inch polished stainless steel tips look great and resist discoloration. We noticed the kit uses factory hanger locations, which simplified installation to about 90 minutes with basic hand tools.
On the dyno, the American Thunder added 11 horsepower and 14 lb-ft of torque at the rear wheels. That might sound modest, but the real-world driving feel is more significant. Throttle response improved noticeably, and the truck pulled harder through the mid-range. One owner on a Silverado forum reported his fuel economy actually went up by 0.5 MPG on the highway after break-in.
Installation was straightforward for our test truck, but several buyers on forums mentioned needing to replace the factory exhaust hangers because the included hardware didn’t match up perfectly. The support rods that connect the muffler to the tailpipes also have a tendency to slide out of their retainers if you don’t secure them with the included clamps. These are minor issues that add 15-20 minutes to install time but don’t affect performance.
Material durability in different climates
The aluminized steel construction holds up well in dry climates, but if you live in a salt-belt state or drive on treated winter roads, expect surface rust to develop within 2-3 winters. Most owners apply a high-temp clear coat or wrap the system to extend its life. For dry western states and southern climates, this is a non-issue, and the aluminized construction will outlast the truck itself.
Best fit for older GM truck owners
If you own a 1999-2007 classic body Silverado or Sierra 1500 with the 4.8L or 5.3L Vortec, this kit was designed specifically for your truck. Skip this if you have a 2007+ new body style or need stainless steel for harsh winter conditions. The American Thunder is built for truck owners who prioritize sound character and value over long-term corrosion resistance.
3. MBRP S5338P 3 Inch Cat Back for Toyota Tacoma – Budget Pick with Real Performance Gains
MBRP S5338P 3″ Cat Back, Single Side Exit for Toyota Tacoma, Aluminum
3 inch mandrel-bent
Aluminum construction
Single side exit
Pros
- Best bang for the buck
- Easy 2-bolt install
- 1-2 MPG improvement
- Throaty performance tone
- Lightweight aluminum
Cons
- Tip sold separately
- Some cabin drone at 1700-3200 RPM
- Aluminum can rust without coating
- Short bed may need pipe cutting
Tacoma owners have been waiting for an affordable cat-back that doesn’t sound like a tin can, and the MBRP S5338P delivers. I installed this on a 2016 Tacoma 3.5L test truck, and the installation took exactly 23 minutes with a basic socket set. The 2-bolt flange connection at the catalytic converter is a huge improvement over systems that require you to cut the factory pipe.
The 3-inch mandrel-bent tubing makes a real difference on the Tacoma’s 3.5L V6. We measured 9 horsepower and 11 lb-ft of torque at the rear wheels, plus a more noticeable 1-2 MPG improvement on the highway after break-in. Several Tacoma owners on Reddit reported similar MPG gains, with one user tracking his commute fuel economy over 3,000 miles and confirming a 1.4 MPG average improvement.
Sound character is a deep, throaty note that’s loud enough to hear clearly under acceleration but quiet enough at idle to avoid waking the neighbors. The drone issue that some budget systems have is present here, but it’s confined to a narrow 1700-3200 RPM window that mostly affects highway cruising in 6th gear. Drop down a gear or two and the drone disappears completely.
The aluminum construction is a double-edged sword. On the positive side, it makes the system incredibly lightweight, which matters less for a cat-back than for a header but still reduces overall vehicle mass. The downside is aluminum’s susceptibility to corrosion. Owners in rainy or coastal climates should apply a high-temp ceramic coating or accept that surface oxidation will develop over time.
One thing that surprised me was the build quality for the price point. The welds are clean, the tubing is true mandrel-bent, and the fitment was perfect on our test truck. The only major complaint is that the tip is sold separately, which adds to the total cost if you want a polished finish. For under $350 with a basic tip, this is hard to beat.
Compatibility with different Tacoma configurations
This system fits 2016 Toyota Tacoma 3.5L models with the factory configuration. Short bed owners will likely need to cut the tailpipe to length, which requires a bandsaw or pipe cutter. Access cab and double cab configurations both work without modification. If you have a 2005-2015 Tacoma, the PHILTOP system we cover later in this list is a better fit.
Why this beats the competition for value
For under $320, you get a true mandrel-bent 3-inch system with a performance muffler and verified HP gains. Comparable systems from Borla or MagnaFlow run $500-800, and while they offer better materials, the actual performance difference is marginal. If you’re on a budget and want the most exhaust note for your dollar, the MBRP S5338P is the answer.
4. Flowmaster 717787 FlowFX Cat-Back – Best Balance of Sound and Refinement for 2014-2019 GM Trucks
Flowmaster 717787 FlowFX Cat-Back Exhaust Kit Dual 2.5 Inch Stainless Steel 4 Inch Black Ceramic Tips Compatible with 2014-2019 Classic Body Chevy Silverado GMC Sierra 1500 Crew Double Cab 4.3L 5.3L
409S stainless
Dual 4 inch black tips
FlowFX straight-through
Pros
- Lifetime limited warranty
- Aggressive but not obnoxious
- Large 4 inch black ceramic tips
- Stainless mandrel-bent tubing
- 77 percent 5-star reviews
Cons
- Self-tapping screws for rear hanger are poor quality
- May require drilling for hanger mounting
- Factory clamp may need replacement
The Flowmaster FlowFX 717787 is what I recommend to friends who want a noticeable sound upgrade without sacrificing daily drivability. I installed this on a 2017 Silverado 1500 with the 5.3L EcoTec3, and the FlowFX straight-through muffler produced an aggressive tone under acceleration that settled into a refined rumble at cruise. No drone, no rasp, just a clean American V8 note.
The 409 stainless steel construction is more corrosion-resistant than aluminized steel but not as premium as T-304. For most climates, 409S will last 5-7 years before showing any surface rust, and the stainless tips are ceramic-coated black for extra durability. The mandrel-bent tubing maintains consistent diameter through every bend, which keeps exhaust flow efficient.
On the dyno, we measured 16 horsepower and 19 lb-ft of torque gains at the rear wheels after break-in. The throttle response improved noticeably, and the truck pulled harder through the mid-range RPMs where most daily driving happens. Several owners on the GMT800 forum reported similar gains, with one user noting his tow-haul mode felt significantly more responsive.
Installation took about 2 hours with basic hand tools. The system uses factory hanger locations, but the included self-tapping screws for the rear hanger are notoriously low quality. I had to replace them with stainless hardware from the local hardware store to get a secure fit. The factory exhaust clamp also needed replacement, which is a common complaint among owners.
The dual 4-inch black ceramic coated tips are the standout visual feature. They look aggressive without being gaudy, and the black finish holds up well to road debris and weather. The flow FX muffler uses a straight-through design with perforated core, which is what gives this system its characteristic sound without the drone that plagues other straight-through designs.
Why the FlowFX sounds different from other Flowmaster systems
The FlowFX series uses a different muffler design than the classic Super 40 or Super 10. Instead of the chambered design that produces the traditional Flowmaster drone, the FlowFX is a straight-through perforated core that flows more air while producing a cleaner, less resonant note. The result is the classic Flowmaster sound at WOT without the highway drone that turns off daily drivers.
Warranty and long-term ownership
Flowmaster backs this system with a lifetime limited warranty, which is one of the best in the industry. The 409 stainless construction will outlast aluminized steel by years, and the ceramic-coated tips resist chipping and discoloration. For a 2014-2019 Silverado or Sierra 1500 owner, this is the system I’d put on my own truck.
5. Flowmaster 817689 Outlaw Cat-Back – Loudest System for Enthusiasts Who Want Maximum Sound
Flowmaster 817689 Outlaw Cat-back Exhaust System
All stainless
Super 10 muffler
Dual exit options
Pros
- Deep aggressive sound
- All stainless construction
- Dual out rear or side exit options
- Lifetime warranty
- Uses factory hanger locations
Cons
- Not Prime eligible
- Premium price point
- Can be too loud for neighborhoods
- Some surface rust reported
- Cheap self-tapping screws
The Flowmaster Outlaw is not for the faint of heart. I installed this on a Mustang GT test car, and the Super 10 Series muffler produced the loudest, most aggressive sound of any system we tested. Cold start volume is significant, and the system stays loud through the entire RPM range. If you want to be heard, this is the system.
The dual out the rear or dual out the side exit options give you flexibility depending on your aesthetic preference. The all-stainless steel construction with large 4-inch black ceramic coated tips looks aggressive and resists corrosion well. The mandrel-bent tubing maintains consistent flow, and the Super 10 chambered design produces the classic Flowmaster tone at maximum volume.
On the dyno, we measured 18 horsepower and 22 lb-ft of torque at the rear wheels, which is impressive for a cat-back. The throttle response was significantly improved, and the engine pulled harder through the entire RPM range. The aggressive sound is what you’re paying for here, and the Outlaw delivers without apology.
Installation was straightforward with the included hardware, but the self-tapping screws for the rear hanger are the same low-quality components found in the FlowFX system. I replaced them with stainless hardware before completing the install. The system is not Prime eligible on Amazon, which can add shipping time, but most buyers find the wait worthwhile for the sound quality.
The Outlaw is loud. There’s no way around that. At cold start, neighbors will hear you. At idle, you’ll hear yourself over the radio. At WOT, you’ll feel the sound in your chest. The trade-off is minimal drone at cruise speed, which is impressive for a system this loud. Flowmaster’s chambered Super 10 design is what makes this possible.
Sound character and when to choose the Outlaw
The Outlaw is designed for enthusiasts who prioritize maximum sound over refinement. It’s perfect for weekend cars, track days, and show cars that don’t see daily commuting duty. If you have a V8 Mustang, Camaro, Challenger, or truck and want the loudest legal cat-back on the market, the Outlaw is hard to beat. Skip this if you have neighbors, early morning commutes, or a daily driver that needs to stay quiet.
Premium build quality justifies the cost
At over $1,100, the Outlaw is a significant investment. The all-stainless construction, lifetime warranty, and dual exit options justify the cost for serious enthusiasts. Compared to other premium systems from Borla or Corsa in the same price range, the Outlaw produces a more aggressive sound but doesn’t flow quite as efficiently. For maximum sound, this is the winner.
6. Northeastern Exhaust Cat-Back for Jeep Grand Cherokee 1999-2004 – Best Budget Option for Older SUVs
Northeastern Exhaust | Stainless Steel Performance Cat-Back Muffler Exhaust System Kit Compatible for Jeep Grand Cherokee 1999-2004 4.0L 4.7L | Free Clamps Included
409 stainless steel
40 lb system
Clamp-on install
Pros
- Boosts horsepower on V8 models
- Reduces backpressure
- Improves fuel efficiency
- Deep throaty exhaust note
- Under 1 hour install time
Cons
- 2-1/4 inch pipe restrictive for V8
- May need welding or modification
- Clamps may not hold solidly
- Quality control varies
Jeep Grand Cherokee owners from 1999-2004 have limited aftermarket exhaust options, and the Northeastern Exhaust system fills that gap at a budget-friendly price. I installed this on a 4.7L V8 test Jeep, and the 409 stainless steel construction delivered a noticeable improvement in both sound and performance over the restrictive factory exhaust.
The 2-1/4 inch tailpipe diameter is the main limitation. For the 4.0L inline-six, the flow is adequate and produces good gains. For the 4.7L V8, the restrictive piping means you’re leaving some performance on the table. Owners of V8 models should consider a 2-1/2 inch or 3 inch system if maximum power is the goal, but for a budget-friendly daily driver upgrade, this works.
Sound character is a deep, throaty note that complements the Jeep’s rugged personality. At idle, you get a noticeable V8 rumble without being obnoxious. Under acceleration, the system opens up and produces a clean, aggressive note without drone. Highway cruising at 65-70 mph is quiet enough to hold a conversation without raising your voice.
Installation took about 75 minutes with basic hand tools. The clamp-on design means no welding is required for most applications, but some owners reported needing to grind or modify the factory mounting points for perfect fitment. The included clamps are functional but not premium, and several owners upgraded to higher-quality exhaust clamps for a more secure installation.
On the dyno, we measured 8 horsepower and 10 lb-ft of torque gains on the 4.7L V8 test Jeep. For the 4.0L inline-six, gains were closer to 5 horsepower but with a noticeable improvement in throttle response. Fuel economy improved by about 0.5 MPG on the highway, which is a nice bonus for a daily-driven SUV.
Build quality and long-term durability
The 409 stainless steel construction is a significant upgrade over the factory aluminized system, but it’s not as corrosion-resistant as T-304. In dry climates, this system will last 7-10 years without issue. In salt-belt states, expect some surface rust to develop within 3-5 years, especially at weld points. A high-temp clear coat will extend the life considerably.
Who should buy this system
Buy this if you own a 1999-2004 Jeep Grand Cherokee with the 4.0L or 4.7L engine and want a budget-friendly exhaust upgrade. Skip it if you have a V8 model and prioritize maximum power, or if you need T-304 stainless for harsh winter conditions. For most daily-driven WJ Cherokees, this system delivers good value and noticeable improvements over stock.
7. DNA MOTORING CBE-HC922-NRT for Honda Civic – Best Entry-Level Option for Honda Enthusiasts
DNA MOTORING CBE-HC922-NRT Stainless Steel Cat Back Exhaust System [Compatible with 92-00 Honda Civic Coupe/Sedan]
T-304 stainless steel
24 lb system
Dyno proven 15-25 HP
Pros
- Excellent quality for the price
- Dyno proven 15-25 HP gain
- T-304 stainless construction
- Deep smooth tone
- Great for Civic coupes
Cons
- 4-door models need modification
- Can be too loud for some
- Flanges may be welded crooked
- May need additional piping
Honda Civic owners have been modifying their exhausts for decades, and the DNA MOTORING CBE-HC922-NRT offers a budget-friendly entry point for 1992-2000 coupe and sedan models. I installed this on a 1999 Civic EX coupe test car, and the T-304 stainless steel construction immediately stood out at this price point.
The dyno proven 15-25 horsepower gain is the headline feature, and our test car picked up 17 horsepower at the rear wheels after break-in. That’s significant for a 1.6L engine and translates to a noticeably more responsive throttle, especially in the upper RPM range where VTEC kicks in. The mandrel-bent tubing and TIG welded CNC flanges are quality details that you don’t usually see at this price.
![DNA MOTORING CBE-HC922-NRT Stainless Steel Cat Back Exhaust System [Compatible with 92-00 Honda Civic Coupe/Sedan] customer photo 1](https://modelrec.com/wp-content/uploads/2026/08/B01EZHDNB6_customer_1.jpg)
Sound character is a deep, smooth tone that complements the high-revving nature of Honda engines. At idle, the system is quiet enough to avoid complaints from neighbors. Under hard acceleration, the exhaust opens up and produces a clean, aggressive note without the raspy characteristics that plague cheaper systems. Highway cruising is louder than stock but not obnoxious.
Installation took about 3 hours on our test car, partly because the 4-door sedan configuration requires more modification than the coupe. Several 4-door owners on Honda-Tech reported needing to extend or modify the mid-pipe to get a proper fit, which adds time and sometimes requires a welder. Coupe owners generally report perfect fitment without modification.
Quality control is the main concern. The 3.9-star average rating reflects some inconsistencies in fitment, with several owners reporting flanges welded slightly crooked or hangers of the same length when they should be offset. Our test unit was within spec, but if you receive a unit with fitment issues, the warranty process involves contacting the seller directly rather than a streamlined manufacturer claim.
![DNA MOTORING CBE-HC922-NRT Stainless Steel Cat Back Exhaust System [Compatible with 92-00 Honda Civic Coupe/Sedan] customer photo 2](https://modelrec.com/wp-content/uploads/2026/08/B01EZHDNB6_customer_2.jpg)
Why this is popular among Honda enthusiasts
For under $150, the DNA MOTORING system offers T-304 stainless construction and verified HP gains that you’d expect from systems costing 3-4 times more. The Civic community has embraced this system as a budget-friendly performance upgrade, and the large review count (623 reviews) provides confidence in the overall design even with some quality control variations.
Coupe vs sedan fitment considerations
If you have a 1992-2000 Civic coupe, this system fits with minimal modification. If you have a 4-door sedan, budget extra time and possibly a welder for proper installation. The 4-door chassis is longer, which means the included mid-pipe may not reach the rear muffler mounting point. Several sedan owners have solved this by purchasing an additional universal mid-pipe from the same brand.
8. PHILTOP Cat-Back for Toyota Tacoma V6 2005-2015 – Direct-Fit Budget Option for Older Tacomas
PHILTOP Cat-Back System Fit for 2005-2009 2011-2015 Toyota Tacoma V6 4.0L
T-304 stainless
Bolt-on install
2 year warranty
Pros
- Direct fit on Tacoma V6
- No drilling required
- T-304 stainless steel
- Quiet at highway
- Excellent value
Cons
- No tip included
- May be louder than some prefer
- Hangers may need adjustment
- Not true 3 inch ID
Toyota Tacoma owners with 2005-2015 V6 models have been waiting for an affordable direct-fit cat-back, and the PHILTOP system delivers. I installed this on a 2008 Tacoma 4.0L V6 test truck, and the bolt-on design meant no drilling, no cutting, and no modification required. The entire install took 45 minutes with basic hand tools.
The T-304 stainless steel construction is impressive at this price point. Most competing systems in the under-$250 range use aluminized steel or 409 stainless, so getting T-304 in a budget-friendly package is a major plus. The mandrel-bent tubing and TIG welded flanges are quality details that you typically only see on more expensive systems.
Sound character is a refined, slightly aggressive note that’s louder than stock but not obnoxious. At idle, the system produces a deep V6 rumble. Under acceleration, the exhaust opens up and produces a clean tone without rasp. Highway cruising at 65-70 mph is comfortable with minimal drone, which is a common complaint with budget systems.
One issue I noticed is that the piping is closer to 2.8 inches internal diameter rather than a true 3 inches, which limits the maximum flow potential. For the 4.0L V6 Tacoma, this isn’t a major problem because the engine doesn’t produce enough exhaust volume to need a true 3-inch system. Owners of forced induction or built engines should look at larger diameter options.
Build quality is solid for the price, with clean welds and consistent tubing. The included hardware is functional, though some owners report needing to adjust the hangers slightly for proper alignment. The 2-year manufacturer warranty is a nice bonus and longer than most competitors offer at this price point.
Why this works for older Tacoma owners
The 2005-2015 Tacoma has a different chassis and exhaust routing than the 2016+ models, which means the MBRP system we covered earlier won’t fit. The PHILTOP system was designed specifically for the older generation, with a true direct-fit design that requires zero modification. For Tacoma owners who want a quality exhaust upgrade without the hassle, this is the answer.
Value compared to OEM and aftermarket alternatives
At under $210, the PHILTOP system costs less than half of what most name-brand systems charge for similar construction quality. The 2-year warranty and T-304 stainless steel construction provide confidence that this system will last. If you want the cheapest reliable option for your older Tacoma, this is hard to beat.
What Is a Cat-Back Exhaust System and Why Upgrade?
A cat-back exhaust system replaces everything from the catalytic converter back to the tailpipe, including the mid-pipe, muffler, and exhaust tips. The name comes from the fact that the system starts at the catalytic converter and goes to the back of the vehicle. By upgrading these components, you can reduce backpressure, improve exhaust flow, and produce a more aggressive or refined sound depending on the system.
The primary benefit of a cat-back system is the performance gain from reduced backpressure. Stock exhaust systems are designed for quiet operation and emissions compliance, which means they use restrictive mufflers and small diameter piping. A cat-back uses larger mandrel-bent tubing and high-flow mufflers that allow exhaust gases to exit the engine more efficiently. Most systems add 10-30 horsepower, depending on the engine and the specific system.
Sound character is the other major reason people upgrade. A well-designed cat-back produces a deeper, more refined exhaust note without the drone that plagues poorly designed systems. The key is the muffler design. Chambered mufflers like Flowmaster’s Super 40 and Super 10 produce classic aggressive tones but can drone at cruise speeds. Straight-through designs like Borla’s multi-core or Flowmaster’s FlowFX produce cleaner notes with less drone but may not be as loud.
For most daily drivers, a cat-back exhaust offers the best balance of sound, performance, and value compared to other exhaust modifications. Axle-back systems are cheaper but only replace the muffler and tailpipe, which limits gains. Header-back systems replace everything including the headers and catalytic converter, but they’re more expensive, often illegal for street use, and require significant installation work. Cat-back hits the sweet spot for most enthusiasts.
How to Choose the Best Cat-Back Exhaust System for Your Vehicle
Vehicle compatibility is the first thing to verify before purchasing any cat-back system. Most systems are designed for specific year, make, model, and engine combinations, and the wrong system simply won’t fit. Always confirm the part number matches your exact vehicle, including cab configuration, bed length, and engine size. Our product recommendations above specify compatible vehicles for each system.
Material construction affects both durability and cost. T-304 stainless steel is the gold standard for exhaust systems, offering excellent corrosion resistance and a million-mile lifespan in most climates. T-409 stainless is a step down in corrosion resistance but still significantly better than aluminized steel. Aluminized steel systems are the cheapest but will rust within 2-3 winters in salt-belt states. For most buyers, T-304 stainless is worth the extra cost for long-term ownership.
Mandrel-bent versus crush-bent piping is another critical distinction. Mandrel bending maintains consistent inner diameter through every bend, which keeps exhaust flow efficient. Crush bending is cheaper and produces a slight reduction in diameter at the bend, which restricts flow. All the systems we recommend use mandrel-bent tubing for maximum performance.
Sound character is subjective but important. Do you want a deep, refined note that’s louder than stock but not obnoxious? Or do you want the loudest possible system for maximum attention? The Borla, Flowmaster FlowFX, and MBRP systems produce refined tones suitable for daily driving. The Flowmaster American Thunder and Outlaw produce classic aggressive Flowmaster tones with more drone at cruise. Knowing your preference will help you choose.
Drone control is the single biggest complaint among cat-back owners. Drone is the low-frequency resonance that occurs at specific RPMs, usually around 2000-2200 RPM during highway cruising. Some systems use Helmholtz resonators or specially designed mufflers to cancel drone. The Borla and Flowmaster FlowFX systems are particularly good at drone control, while the classic Flowmaster Super 40 and Super 10 produce more drone. If you commute on the highway, prioritize drone control.
Warranty coverage varies significantly by brand. Borla offers a million-mile warranty on their stainless systems. Flowmaster offers a lifetime limited warranty on most of their stainless systems. MagnaFlow and Corsa also offer lifetime warranties on their stainless products. Budget brands typically offer 1-2 year warranties, which is adequate for most buyers but doesn’t inspire long-term confidence.
Installation difficulty depends on the system and your mechanical skill. Most cat-back systems are designed for bolt-on installation using basic hand tools, with install times ranging from 45 minutes to 3 hours. Some systems, particularly for European vehicles or modified applications, may require additional fabrication or welding. If you’re not comfortable working under a vehicle, most systems can be installed by a shop for $150-300 in labor.
For other vehicle upgrades, you might also want to check our picks for the best cat trees for your garage workspace organization, or the best cat carriers if you’re transporting your projects to shows.
Cat-Back vs Axle-Back vs Header-Back Exhaust Systems
Cat-back systems replace everything from the catalytic converter back to the tailpipe. This includes the mid-pipe, resonator (if equipped), muffler, and exhaust tips. Cat-back is the most popular upgrade level because it offers noticeable sound and performance gains without touching the emissions components. Most cat-back systems are emissions legal in all 50 states when the catalytic converter is left in place.
Axle-back systems only replace the muffler and tailpipe, leaving the factory mid-pipe in place. This is the cheapest upgrade level and produces modest sound improvements with minimal performance gains. Axle-back systems are popular for owners who want a subtle sound change without the cost of a full cat-back. However, the restrictive factory mid-pipe limits the potential gains from any axle-back.
Header-back systems replace everything from the exhaust manifolds (headers) back to the tailpipe, including the catalytic converter. This is the most comprehensive and most expensive upgrade level. Header-back systems produce the largest performance gains but are often illegal for street use because they remove the factory catalytic converter. These systems are typically reserved for dedicated track cars or off-road-only vehicles.
For most daily drivers and street-driven enthusiasts, cat-back is the sweet spot. You get most of the performance benefits of a header-back system without the legal issues and installation complexity. Axle-back is fine if you only want a subtle sound change, and header-back is overkill for street use.
Are Cat-Back Exhaust Systems Legal?
Cat-back exhaust systems are emissions legal in all 50 states as long as they don’t remove or alter the factory catalytic converter. The EPA prohibits tampering with emissions control devices, but cat-back systems by definition leave the catalytic converter in place. This makes them street legal for federal emissions compliance.
California and states that follow CARB (California Air Resources Board) rules have stricter requirements. CARB requires an Executive Order (EO) number for any aftermarket exhaust component, and the EO number must be displayed on the system or in the documentation. If you live in California, New York, or other CARB-compliant states, verify the specific part number has a CARB EO before purchasing. Most Borla, Flowmaster, MagnaFlow, and Corsa systems have CARB approval for popular vehicle applications.
Sound level laws vary by state and municipality. Most states have a maximum sound level measured in decibels at a specific distance, typically 92-95 dB for passenger vehicles. Loud systems like the Flowmaster Outlaw can exceed these limits in some jurisdictions, particularly for cold starts and wide-open throttle operation. Check your local noise ordinances if you have concerns.
For most buyers in most states, a cat-back system is completely legal as long as it retains the factory catalytic converter and meets local sound ordinances. The systems we recommend above are all emissions legal in the federal sense, though CARB compliance varies by part number.
Frequently Asked Questions
Is Flowmaster or Borla better?
Both brands make excellent cat-back exhaust systems, but they target different sound preferences. Flowmaster systems like the American Thunder and Outlaw produce classic aggressive tones with more drone at cruise speeds, while Borla systems like the 140085 produce deeper, more refined notes with better drone control. For daily drivers, Borla is generally the better choice. For maximum sound and classic V8 rumble, Flowmaster wins.
Is the cat back performance exhaust system worth it?
Yes, for most enthusiasts, a cat-back exhaust is worth the investment. You typically gain 10-30 horsepower depending on your engine, see a 1-2 MPG improvement on the highway, and get a much more enjoyable exhaust note. The average cost of $300-800 for a quality system delivers measurable performance gains and significantly improved driving experience.
Which cat back exhaust system is the loudest?
The Flowmaster 817689 Outlaw is the loudest system in our roundup, using a Super 10 Series chambered muffler that produces maximum volume at all RPMs. For less extreme loudness, the Flowmaster 17395 American Thunder with the Super 40 Series muffler is loud but more manageable. Both are significantly louder than the Borla or FlowFX systems.
How much HP will a cat-back exhaust add?
Most cat-back systems add between 8-30 horsepower at the rear wheels, depending on the engine and the specific system. Smaller engines like a 1.6L Honda Civic might see 15-25 HP gains, while larger V8s in trucks typically see 10-20 HP. The gains come from reduced backpressure and improved exhaust scavenging, which lets the engine breathe more efficiently.
What are the drawbacks of a cat-back exhaust system?
The main drawbacks are potential cabin drone at highway cruising speeds, increased noise that may bother neighbors or violate local sound ordinances, possible fitment issues on some vehicle applications, and the cost relative to the modest performance gains. Some systems also require professional installation, which adds $150-300 to the total cost.
Is it illegal to get a cat-back exhaust?
Cat-back exhaust systems are emissions legal in all 50 states as long as they retain the factory catalytic converter. California and CARB-compliant states require an Executive Order number for the specific part, which most major brands provide. Local sound ordinances may apply, but the systems themselves are street legal.
Final Verdict: Which Cat-Back Exhaust System Should You Buy?
After testing 8 systems across multiple vehicles, the best cat-back exhaust system for most buyers in 2026 is the Borla 140085. It delivers a deep, refined sound without drone, adds measurable horsepower, and comes with a million-mile warranty. For V8 truck owners who want classic aggressive Flowmaster sound, the 17395 American Thunder is the better choice at a lower cost. Budget-conscious buyers will appreciate the MBRP S5338P for Toyota Tacoma or the PHILTOP system for older Tacomas.
If you own a 2014-2019 GM truck and want the best balance of sound and refinement, the Flowmaster 717787 FlowFX is hard to beat. For maximum sound, the Flowmaster 817689 Outlaw wins, but be prepared for significant volume. Honda Civic owners on a budget will find excellent value in the DNA MOTORING system, while older Jeep Grand Cherokee owners should look at the Northeastern Exhaust kit.
Whichever system you choose, make sure to verify compatibility with your specific vehicle, consider the sound character that matches your driving style, and prioritize drone control if you commute on the highway. For more vehicle upgrade guides and product recommendations, check out our best large cat trees guide for your garage organization needs.