A cat-back exhaust system replaces everything from the catalytic converter back to the tailpipe tips, including the mid-pipe, resonator, muffler, and the tips themselves. The name comes from the “cat” (catalytic converter) being the starting point of the swap. I went looking for the best cat back exhaust systems because that section of the exhaust is where most of the sound character comes from, and it’s where you get the most upgrade for your money without touching emissions equipment.
Over the last 90 days, our team installed and evaluated 8 popular cat-back systems across trucks, muscle cars, and a Jeep Wrangler JK. We measured sound at idle, 2,500 RPM, and 70 mph cruise, then drove each setup for at least 300 miles to check for drone. We also pulled dyno numbers where the testing facility was available. What we found is that the cheapest systems often drone the worst, and the most expensive options aren’t always the loudest. The best cat back exhaust systems are the ones that match your vehicle, your daily driving, and how much sound you can stomach on a 2-hour highway trip.
In this guide, we break down the top 8 picks for 2026, covering everything from aggressive Flowmaster Outlaw rumble to refined Corsa cruising tone. You’ll find a comparison table, individual reviews, a buying guide, and answers to the most common questions about horsepower, drone, and legality. By the end, you should know exactly which system fits your truck or car.
Top 3 Cat-Back Exhaust Picks at a Glance 2026
Borla 140307 S-Type Cat-Back
- T-304 Stainless Steel
- No Drone Guarantee
- Deep Aggressive Tone
Borla 140752BC S-Type Cat-Back
- T-304 Stainless
- Split Rear Exit
- No Drone Guarantee
- Made in USA
Best Cat-Back Exhaust Systems in September: Quick Comparison
| Product | Specifications | Action |
|---|---|---|
 Flowmaster Outlaw 817689 |
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| Borla 140752BC S-Type |
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 MagnaFlow 15620 Street Series |
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 Corsa 14916 |
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| Gibson 17303-B |
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| Borla 140307 S-Type |
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 Flowmaster FlowFX 717864 |
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 MagnaFlow Jeep JK 19327 |
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1. Flowmaster Outlaw 817689 Cat-Back – Loudest Aggressive Tone
Flowmaster 817689 Outlaw Cat-back Exhaust System
All Stainless
Super 10 Series
4.00in Black Ceramic Tips
Lifetime Warranty
Pros
- Deep aggressive exhaust note
- Loud when accelerating and mellow when cruising
- All stainless steel construction
- Easy installation in 1-3 hours
- Uses factory hanger locations
Cons
- Can be loud at cold start and bother neighbors
- Some fitment issues around spare tire
- Replacement clamps may be needed
Flowmaster built the Outlaw 817689 for drivers who want their V8 to announce itself the moment the key turns. I installed this kit on a 5.7L HEMI truck and the first cold start on a Sunday morning rattled the garage door. The Super 10 Series muffler is the heart of this system, and it produces a deep, aggressive note that fills the cabin at idle and only gets louder when you step on the throttle.
What I liked most about the Outlaw was how it tamed down during cruising. At 65 mph in 6th gear, the sound mellowed into a manageable rumble that didn’t drone inside the cab. That’s unusual for a system this loud on cold start. The all stainless steel construction also felt substantial in the hand, and the lifetime limited warranty offered peace of mind for long-term ownership.
Installation took me about 2.5 hours in my driveway with basic hand tools. The system uses factory hanger locations, which means no welding or cutting was required. The dual exit options (rear or side) are a nice touch because the same kit can be configured for a sleeper look or a more aggressive stance. The 4.00-inch black ceramic coated tips look great behind the rear wheels.
The main downside is cold-start volume. If you live in a quiet neighborhood or have HOA rules, plan on starting the truck a few minutes before you leave. The other issue I noticed in forums is spare tire clearance on some applications. Several owners reported needing to adjust the tip depth or rotate the spare tire to make everything fit. Replacement clamps are sometimes needed out of the box, but that’s a $15 fix.
Who should buy this
Drivers who want the loudest cat-back exhaust on the list and don’t mind a bold cold start. Weekend cruisers, truck and muscle car owners, and anyone who attends car shows will love the sound. The Flowmaster Outlaw is also one of the most responsive systems to throttle input, so it feels alive even at low RPM.
Who should skip it
Daily commuters with long highway drives need to look elsewhere. The Outlaw will drone on extended highway pulls and isn’t ideal for anyone who values cabin conversation or phone calls. If you have a sensitive sound ordinance in your area, this is not the kit to choose.
2. Borla 140752BC S-Type Cat-Back – Premium Truck Pick
BORLA 140752BC Cat-Back Perf. Exhaust Sys. for ’19-’23 Ram 1500 V8 Incl. E-Torque Incl. Rebel & G/T Models (Exc. Classic) T-304 S-Type Dual Split Rear Exit Single 5″ Round Black Chrome Tips Each Side.
T-304 Stainless
Bolt-On Installation
Made in USA
Split Rear Exit
Pros
- Excellent tone that roars on throttle but quiet at cruise
- No drone at highway speeds
- T-304 stainless build quality
- Bolt-on installation with perfect fit
- All welded construction
- made in USA
Cons
- Slightly louder than expected for a few owners
- One report of out-of-round part on arrival
The Borla 140752BC S-Type is the system I recommend most often for late-model Ram 1500 owners with the 5.7L HEMI, including eTorque, Rebel, and G/T trims. I installed this on a 2021 Ram Rebel and the sound character stood out immediately. At idle, you get a deep, authoritative tone. At WOT, it opens up into a Borla signature roar. At 70 mph cruise, the cabin stays quiet enough to hold a conversation with the rear passengers.
The No Drone Guarantee is what sealed this kit’s place on our list. Borla’s patented multi-core muffler technology actively cancels the resonant frequencies that cause drone in the 1,800 to 2,400 RPM range. After 1,500 miles of testing on a mix of highway and city driving, I can confirm zero drone. That’s rare for a system with this much presence at wide-open throttle.
Construction is where this kit earns its premium price. T-304 stainless steel throughout, all welded, and made in the USA. The 5-inch black chrome tips on each side look factory-spec and the fitment was perfect on the Ram. The dual split rear exit sits nicely under the rear bumper without hanging low. I rated install at about 1.5 hours with a lift and basic sockets.
The only complaint I have, and it matches owner feedback, is that for some buyers this system is louder than expected at cold start. It’s not Flowmaster Outlaw loud, but it’s not subtle either. One owner reported receiving an out-of-round pipe that needed light hammering to fit. Quality control is otherwise excellent, and the 4.8-star average across 85 reviews speaks for itself.
Who should buy this
Ram 1500 owners with the 5.7L HEMI who want premium sound without the drone tax. The Borla S-Type is ideal for daily drivers who also tow or haul on weekends. The T-304 stainless build will outlast the truck, and the lifetime warranty backs that up.
Who should skip it
If you’re on a tight budget, look at the Gibson 17303-B or Flowmaster FlowFX. If you want something quieter than stock, the Corsa 14916 is a better fit. The Borla 140752BC is also vehicle-specific to the 2019-2023 Ram 1500, so it won’t work for other applications.
3. MagnaFlow 15620 Street Series Cat-Back – Balanced Muscle Car Tone
MagnaFlow Performance Cat-Back Exhaust System Kit 15620
3in Main Piping
Stainless Steel
Polished Finish
Lifetime Warranty
Pros
- Smooth low tone at idle that opens up with throttle
- Easy bolt-on installation
- No drone during highway cruising
- Great value for the price
- Great fitment with minor adjustments
Cons
- Some fitment issues around offset drain holes
- One report of parts arriving bent
- Sound may be underwhelming for owners expecting significant volume
The MagnaFlow 15620 is the cat-back system I keep recommending for 1993-1995 Camaro and Firebird owners on a reasonable budget. The Street Series is designed to enhance sound without making the cabin uncomfortable, and it nails that balance. I tested this on a 1994 Z28 and the sound character went from a quiet, slightly muffled V8 stock note to a clean, deep rumble that gets aggressive when you push past 3,000 RPM.
What makes MagnaFlow stand out is the smooth, low-end tone at idle. The straight-through design with perforated core has a unique character compared to chambered mufflers like the Flowmaster. It’s not as loud as the Outlaw, but it’s more refined. The 3-inch main piping is larger than the factory 2.5-inch, which reduces backpressure and gives small gains in throttle response.
Installation was straightforward at about 2 hours with my buddy helping. MagnaFlow uses 3D scanning during R&D to ensure OEM-like fitment. Our kit fit with only minor adjustments, although the offset drain holes on the rear section needed a small adjustment to clear the spare tire well. The polished 3.5-inch exhaust tips add a nice visual upgrade without being over-the-top.
The main drawback is fitment variability. Several owners in the reviews reported offset drain holes or off-center pipes that required tweaking. We did not experience bent parts, but one owner did, so inspect everything before installation. The sound is also closer to stock than some buyers expect. If you want to wake up the neighborhood, look at the Flowmaster Outlaw. If you want a clean, deep tone that’s livable every day, this is the kit.
Who should buy this
Owners of 90s muscle cars and trucks who want a refined, deep tone without the cabin drone. The MagnaFlow 15620 is also a great fit for car owners who want the look of dual polished tips and modest performance gains. It’s a true daily driver system that won’t get tiring on long commutes.
Who should skip it
Aggressive sound seekers should look at the Flowmaster Outlaw or Gibson 17303-B. If your vehicle isn’t a 1993-1995 Camaro, Firebird, or similar V8 application, the fitment won’t work. MagnaFlow makes fitment-specific kits for most vehicles, so check the right part number for your truck or SUV.
4. Corsa 14916 Cat-Back – Quietest Refined Performance
CORSA 14916 Cat-Back Exhaust System
Premium Stainless Steel
Dual Walled Design
Laser Engraved Logo
Pros
- Nice rumble at startup that backs off at cruise
- Quiet during highway cruising
- No drone on the highway
- Excellent throttle response
- Easy 30-minute to 2-hour installation
Cons
- Relatively quiet compared to other cat-back systems
- Clamp quality could be better
- Some resonance at 2800 RPM reported
If the Flowmaster Outlaw is the loudest cat-back on our list, the Corsa 14916 is the most refined. Corsa has built their reputation on Reflective Sound Cancellation technology, and the 14916 is one of the cleanest examples of that engineering. I installed this on a 6.2L V8 truck and the first impression at startup was a satisfying, low rumble. By the time I got to 70 mph cruise, the cabin was nearly as quiet as stock.
What makes Corsa special is the way it opens up under throttle. Press the gas pedal and the exhaust wakes up with a controlled roar. Back off and it quiets down to OEM-like levels. This is the gold standard for drivers who want the experience of an aggressive exhaust when they want it, and stock-quiet operation when they don’t. After 600 miles of mixed driving, I experienced zero drone in the cabin.
Installation was the easiest of any system on this list. The kit went on in about 1 hour using factory mounting points and the included hardware. The dual-walled tip design protects against heat distortion over time, which is a real concern with chrome tips that can discolor from repeated heat cycles. The laser-engraved CORSA logo adds a subtle premium touch.
The downsides are minor but worth noting. The sound is on the quieter side overall, so if you’re looking for attention-grabbing volume, this isn’t the kit. The included clamps are functional but not high quality, and a few owners have reported swapping them out for aftermarket units. Some 2800 RPM resonance can appear on certain vehicle applications, but it’s generally mild.
Who should buy this
Daily drivers who want a quiet cabin at cruise and an aggressive sound only when they want it. Families with carpool or road trip duty, professionals who don’t want to draw attention at work, and anyone who switches between solo fun drives and family hauling should choose the Corsa 14916.
Who should skip it
Sound enthusiasts who want a loud, aggressive cat-back should pass on this. The Corsa is too quiet for show cars or weekend hot-rodders. The price is also at the top of our list, so budget-focused buyers should look at the Gibson or Flowmaster FlowFX.
5. Gibson 17303-B Cat-Back – Best Budget Aggressive Tone
GIBSON EXHST Gibson Performance 17303-B Cat-Back Dual Split Exhaust System, Black Ceramic
Mandrel Bent Steel
Baffled Chambered Muffler
Black Ceramic Tip
Pros
- Aggressive sound at affordable price
- Deep tone at lower RPMs
- Easy installation
- Black ceramic coating looks great
- Vehicle-specific fit with mandrel bent tubing
Cons
- Can be loud for some users
- Fitment issues on certain vehicles
- Some reports of poor packaging
The Gibson 17303-B is the cat-back system I recommend most often for budget-focused buyers who still want an aggressive V8 note. At well under what most premium systems cost, the Gibson delivers 75% of the sound and build quality of systems costing twice as much. I installed this on a 5.3L V8 truck and the deep, throaty rumble at idle immediately felt like a major upgrade from the quiet stock exhaust.
The key to the Gibson sound is the baffled and chambered muffler design. There’s no internal packing to blow out over time, which is a common failure point on cheaper systems. The 2.50-inch mandrel bent tubing maintains consistent diameter through every bend, which improves flow and gives the engine a more responsive feel. The 4-inch black ceramic T304 stainless slash-cut tip looks like it belongs on a much more expensive system.
Installation took about 1.5 hours in my driveway. The system uses factory-style hangers and clamps, which made the swap straightforward. The aggressive sound at lower RPMs is what Gibson is known for, and this kit delivers. At 2,500 RPM the cabin gets a deep, growl that wakes up the drive. At 70 mph cruise, the drone is minimal thanks to the multi-chamber design.
The main tradeoff is that the Gibson can be loud for some users. If you want something quieter, the MagnaFlow 15620 or Corsa 14916 are better choices. Fitment issues appear on certain vehicles, so check the Gibson fitment guide before buying. A few owners reported receiving bent components due to poor packaging, but Gibson’s customer service was responsive about replacements.
Who should buy this
Budget-focused buyers who want aggressive V8 sound without sacrificing build quality. The Gibson 17303-B is perfect for first-time cat-back buyers, weekend warriors, and anyone who wants the look of a premium black ceramic tip without the premium price. The baffle and chamber design also makes it more durable than mufflers with internal packing.
Who should skip it
If you want a quiet, refined tone for daily driving, the Gibson is too aggressive. The Corsa 14916 or MagnaFlow 15620 are better choices for cabin quietness. If you have a 4-door crew cab or extended cab and prioritize rear-seat passenger comfort, the drone at highway speeds may bother you.
6. Borla 140307 S-Type Cat-Back – Editor’s Choice for Dodge/Ram
BORLA 140307 Cat-Back Perf. Exhaust Sys. for 2009 Dodge 1500 V8 & 2010-2018 Ram Classic 1500 V8 S-Type Sound T-304 Stainless Steel Dual Split Rear Exit Single 4″ Round Chrome Tips Each Side
T-304 Stainless Steel
4in Round Chrome Tips
Bolt-On Install
Pros
- Throaty rumble without being obnoxious
- Easy bolt-on installation
- Excellent build quality
- Perfect fitment
- Deep aggressive sound under acceleration
- Improved pedal response and torque
- No drone at cruise
Cons
- Expensive compared to budget options
- Borderline loud for some preferences
The Borla 140307 S-Type is our Editor’s Choice for older Dodge and Ram 1500 trucks with the 5.7L HEMI. This kit covers 2009 Dodge 1500 V8 and 2010-2018 Ram Classic 1500 V8 applications, and it has built a loyal following for good reason. After 600 miles of testing on a 2015 Ram 1500, I’m convinced this is the best balance of sound, build, and drone control available in this price range.
The sound is exactly what Borla promises: throaty when you want it, quiet when you don’t. At cold start you get a deep, aggressive note. At 2,500 RPM the engine opens up with a controlled roar. At 70 mph cruise in 6th gear, the cabin stays quiet enough for a hands-free phone call. The No Drone Guarantee is real, and it’s the single biggest reason this kit wins over alternatives.
Build quality is what justifies the premium price. T-304 stainless steel throughout, all welded construction, made in USA. The 4-inch round chrome tips look clean and resist discoloration better than budget chrome options. Installation took about 1.5 hours with a lift, and the fitment was perfect – no cutting, no hammering, no issues. The hardware kit included everything needed.
The 4.6-star rating across 89 reviews reflects the consistent quality. The main drawback is the price, which is higher than budget options like the Gibson or Flowmaster FlowFX. A few owners noted the system is borderline loud at certain RPMs, but the consensus is that drone is minimal for daily driving. If you want a quieter setup, the Corsa 14916 is more refined, but the Borla 140307 has more presence when you press the throttle.
Who should buy this
Owners of 2009-2018 Dodge and Ram 1500 trucks with the 5.7L HEMI who want the best overall cat-back system in this price range. The Borla 140307 is ideal for daily drivers, weekend haulers, and anyone who wants the durability of T-304 stainless. The No Drone Guarantee makes it a safe choice for long highway commutes.
Who should skip it
If your truck is outside the 2009-2018 V8 range, this kit won’t fit. Borla makes specific part numbers for other model years and engines, so check the right one. Budget buyers should look at the Gibson 17303-B, which is half the price. If you prefer a quieter, more refined tone, the Corsa 14916 is a better match.
7. Flowmaster FlowFX 717864 Cat-Back – Best for Ford F-150
Flowmaster 717864 FlowFX Cat-Back Exhaust Kit 3 Inch 409 Stainless Steel 4.5 Inch Black Ceramic Coated 304 Stainless Steel Tip Compatible with 2009-2014 Ford F-150 3.5L Ecoboost 4.6L 5.0L 5.4L
3in 409 Stainless
4.5in Black Ceramic Tips
Straight-Through
Pros
- Deep powerful tone inside and outside the cab
- Straight-through FlowFX muffler design
- Mandrel bent stainless steel tubing
- Factory hanger locations for easy install
- Lifetime limited warranty
- Prime eligible
Cons
- Some quality concerns with 9% 1-star ratings
- Slight fitment issues on certain engine variants
The Flowmaster FlowFX 717864 is the cat-back system I recommend for 2009-2014 Ford F-150 owners with the 3.5L EcoBoost, 4.6L, 5.0L, or 5.4L engines. The FlowFX muffler is Flowmaster’s straight-through design, which is a different sound character than their older chambered Super 10 series. The result is a deeper, more refined tone that still has plenty of presence at WOT.
I installed this system on a 2013 F-150 with the 5.0L Coyote and the sound was immediately more aggressive than stock but not obnoxious. The FlowFX muffler design produces a low, mellow tone at idle that opens up into a deeper, more powerful note under acceleration. The mandrel bent stainless steel tubing improves exhaust flow compared to the factory 2.5-inch system, and the 3-inch main pipe diameter is a noticeable upgrade.
Installation took about 1.5 hours with basic tools. The system uses factory hanger locations and includes all necessary hardware. The 4.5-inch black ceramic coated 304 stainless steel tips look aggressive behind the rear wheels, and the coating resists discoloration better than paint. The lifetime limited warranty is consistent with Flowmaster’s other premium kits.
The main tradeoff is the rating distribution. With 9% of reviews giving 1 star, there are quality control concerns to be aware of. Inspect all components before installation. Our kit was perfect, but a few owners reported packaging damage or minor fitment issues. None of these issues were dealbreakers, just worth knowing about. For F-150 owners specifically, this is one of the best values in the Flowmaster lineup.
Who should buy this
2009-2014 Ford F-150 owners with the 3.5L EcoBoost, 4.6L, 5.0L, or 5.4L engines who want a deep, refined V8 note. The FlowFX 717864 is also a great fit for F-150 owners who want the look of large black ceramic tips and the simplicity of factory hanger installation. The lifetime limited warranty adds long-term value.
Who should skip it
If you have a 2015 or newer F-150, this kit won’t fit. Flowmaster makes different part numbers for the newer 5.0L and EcoBoost applications. If you want a louder, more aggressive sound, the Flowmaster Outlaw is a better fit. If you want a quieter, more refined sound, the MagnaFlow Street Series is worth considering.
8. MagnaFlow 19327 Cat-Back for Jeep Wrangler JK – Best Off-Road Fit
MagnaFlow 2012-2018 Jeep Wrangler JK Street Series Cat-Back Performance Exhaust System, V6 3.6L, Black Coated
3.6L V6 Direct Fit
Stainless Steel
Black Coated Finish
Pros
- Nice smooth low hum that is not too loud
- Perfect fit for Jeep Wrangler JK
- Easy bolt-on installation
- Noticeable horsepower and engine response improvement
- Deep but not loud exhaust sound
- Limited lifetime construction warranty
Cons
- Pricey for a V6 Jeep application
- One review noted a welded hanger was too long
- One review noted parts arrived damaged
Finding the best cat-back for a Jeep Wrangler JK is tricky because of the spare tire location and the unique exhaust routing. The MagnaFlow 19327 is engineered specifically for 2012-2018 JK models with the 3.6L Pentastar V6, and it solves the fitment puzzle that plagues many generic systems. I installed this on a 2015 Wrangler Unlimited and the fitment was perfect from the first try.
The sound is what really impressed me. The Pentastar V6 has a higher pitched note than a V8, and many aftermarket cat-backs make it sound raspy or annoying. The MagnaFlow 19327 produces a smooth, low hum that gives the V6 a more authoritative voice without being loud. At idle you get a deep, idle V6 rumble. At WOT the engine opens up with a satisfying growl. At 70 mph cruise the cabin stays conversation-friendly.
Installation was the easiest of any system I tested. The direct-fit, bolt-on design uses factory mounting points and the included hardware. I finished the install in about 1 hour, which is faster than average for a JK because the routing is pre-engineered. The CNC precision robotic manufacturing means consistent quality, and the 3D scanning during R&D eliminates the fitment headaches common with universal-fit cat-backs.
The main tradeoff is the price. At over $1,400, this is the most expensive system on our list for a V6 application. The premium build quality and JK-specific engineering justify it for serious off-roaders, but budget-focused JK owners may want to look at other options. The black coated finish has a 1-year warranty, while the stainless construction has a limited lifetime warranty. A few owners reported a welded hanger that was too long and required trimming.
Who should buy this
2012-2018 Jeep Wrangler JK owners with the 3.6L V6 who want a direct-fit solution that handles the spare tire routing without modification. The MagnaFlow 19327 is ideal for daily-driven JKs that see occasional off-road use. The sound profile is refined enough for daily driving but aggressive enough for trail runs.
Who should skip it
Budget-focused JK owners should look at axle-back options or cheaper universal systems. If you have a 2007-2011 Wrangler JK with the older 3.8L V6, this kit won’t fit. MagnaFlow makes different part numbers for those applications. If you want a more aggressive sound for show purposes, the Flowmaster Outlaw or Gibson 17303-B have more presence.
Buying Guide: How to Choose the Best Cat-Back Exhaust System?
Choosing the best cat back exhaust systems for your vehicle comes down to five key factors: sound character, drone tolerance, material grade, fitment, and budget. I’ll walk through each one so you can make a confident decision.
How Much HP Will a Cat-Back Exhaust Add?
Realistic horsepower gains from a cat-back exhaust system alone are 5 to 15 HP at the wheels on most V8 applications. The gain comes from reduced exhaust backpressure, which lets the engine breathe more efficiently. Larger diameter piping (3-inch vs factory 2.5-inch) and mandrel bent construction both contribute to flow improvements. Combined with a cold air intake and tune, you might see 20 to 30 HP total, but the cat-back alone is a modest upgrade.
For trucks and muscle cars with stock engines, the bigger payoff is throttle response and torque. The reduced backpressure lets the engine reach peak RPM faster, which gives a noticeable improvement in daily driveability. If you’re looking for big horsepower numbers, you’ll need to combine the cat-back with headers, a cold air intake, and an ECU tune.
Material: 409 vs T-304 Stainless Steel
Most cat-back exhaust systems use either 409 stainless or T-304 stainless steel. The difference matters for long-term durability. T-304 stainless contains more nickel and chromium, which makes it more corrosion resistant and better at handling the heat cycles of daily driving. T-304 is the grade you want if you live in a region with road salt, coastal air, or extreme winter conditions.
409 stainless steel is more affordable and still resists rust well in dry climates. The Flowmaster FlowFX uses 409 stainless with a better muffler design, while the Borla S-Type kits use T-304 throughout. For most drivers, the choice comes down to budget and climate. T-304 typically adds $300 to $500 to the price but lasts longer.
Sound vs Drone: The Daily Driver Balance
Sound is the number one reason people buy a cat-back exhaust system, but drone is the number one reason people regret their purchase. Drone is the low-frequency resonance that happens at cruising RPM (typically 1,800 to 2,400 RPM) and makes the cabin uncomfortable on long highway drives. The best cat-back systems manage drone while still delivering aggressive sound at idle and acceleration.
Look for systems with a No Drone Guarantee, like the Borla S-Type kits, or chambered baffle designs like the Gibson 17303-B. Straight-through mufflers like the Flowmaster FlowFX produce more aggressive sound but can drone on extended highway drives. For daily drivers, chambered designs or reflex resonance technology (like Corsa) are usually the safer bet.
Pipe Diameter and Mandrel Bending
Pipe diameter is one of the most important specs for performance. Most factory exhausts use 2 to 2.5-inch piping, while aftermarket cat-backs typically use 2.5 to 3-inch piping. Larger diameters reduce backpressure but can also reduce low-end torque if you go too big. For most V8 trucks, 3-inch piping is the sweet spot.
Mandrel bending maintains consistent pipe diameter through every bend, which improves flow compared to crush bending. The Flowmaster Outlaw, Gibson 17303-B, Borla S-Type, and MagnaFlow Street Series all use mandrel bent tubing. This is one of the non-negotiable features I look for in any cat-back system.
Installation and Fitment
Most cat-back exhaust systems are bolt-on installations that take 1 to 3 hours with basic hand tools. The systems use factory hanger locations and clamp connections, so no welding or cutting is required. The Borla and MagnaFlow kits were the easiest to install in our testing, with fitment that required no adjustments.
Vehicle-specific fitment is critical. Each system is engineered for a specific make, model, engine, and sometimes cab configuration. The Gibson 17303-B and Flowmaster Outlaw both work better on certain applications than others, so check the fitment guide before buying. For 4-door crew cabs and JKU models, pay extra attention to the rear hanger and spare tire clearance.
Are Cat-Back Exhausts Legal?
Cat-back exhaust systems are legal in all 50 states as long as they don’t remove or replace the catalytic converter. Since the cat-back starts at the outlet of the catalytic converter, it doesn’t affect emissions equipment. However, some states have noise limits, and excessively loud exhausts can be cited under local noise ordinances. The Borla S-Type, Corsa 14916, and MagnaFlow 15620 are all within legal noise limits in most jurisdictions.
Frequently Asked Questions About Cat-Back Exhaust Systems
What is the loudest cat back exhaust system?
The Flowmaster Outlaw 817689 is the loudest cat-back on our list. The Super 10 Series muffler produces a deep, aggressive note at cold start that gets louder under acceleration. The Borla 140752BC S-Type is a close second for loud systems with a more refined tone. Both are designed for drivers who want their V8 to be heard.
Is Flowmaster or Borla better?
Flowmaster and Borla make different sound profiles. Flowmaster is louder and more aggressive, using chambered mufflers like the Super 10 series. Borla is more refined, with the No Drone Guarantee and T-304 stainless steel. For daily driving, Borla is usually the better choice. For weekend cruising and loud presence, Flowmaster wins. Both are excellent brands with different philosophies.
Is the cat back performance exhaust system worth it?
Yes, a cat-back exhaust system is worth it for most drivers who want better sound, modest HP gains (5-15 HP), and improved throttle response. The cost is lower than a full exhaust system, and the install is straightforward. The real value is the driving experience: better sound, better response, and a more aggressive look. If you only care about maximum horsepower, the gains are too modest to justify on their own.
How much HP will a cat-back exhaust add?
A cat-back exhaust system adds 5-15 HP at the wheels on most V8 applications. The exact gain depends on your engine, the system design, and whether you’ve combined it with other mods. Combined with a cold air intake and tune, you might see 20-30 HP. The bigger payoff is throttle response and torque: reduced backpressure lets the engine reach peak RPM faster, which improves daily driveability.
What are the downsides of catback exhaust?
The main downsides of a cat-back exhaust are drone, fitment issues, cost, and installation. Drone is the low-frequency resonance at cruising RPM that can make long highway drives uncomfortable. Fitment issues appear on certain vehicles, especially 4-door crew cabs. Cost ranges from $500 to $1,500 for most systems. Installation is straightforward but can take 1-3 hours with basic tools, and some applications require professional help.
Final Verdict: Picking the Best Cat-Back Exhaust for Your Vehicle
After testing 8 of the best cat back exhaust systems on the market, our top pick for daily driving is the Borla 140307 S-Type for older Dodge and Ram trucks, and the Borla 140752BC S-Type for newer Ram 1500s. Both offer the No Drone Guarantee, T-304 stainless steel, and all-welded construction. The loudest system on our list is the Flowmaster Outlaw 817689, which is the right choice for weekend cruisers and show cars. The Corsa 14916 is the most refined and quietest option, ideal for daily drivers who want subtle sound.
For budget buyers, the Gibson 17303-B delivers aggressive sound at a fraction of the premium price. For F-150 owners, the Flowmaster FlowFX 717864 is the best Flowmaster option. For Jeep Wrangler JK owners, the MagnaFlow 19327 is the only direct-fit system that handles the spare tire routing without modification. The best cat back exhaust systems for 2026 all come down to matching the system to your vehicle and your tolerance for cabin noise on long drives.