15 Best Cat Back Exhaust Systems for Muscle Cars (June 2026) Expert Picks

There is nothing quite like firing up a muscle car and hearing that deep, rumbling exhaust note shake the ground beneath you. If you own a Mustang, Camaro, Challenger, or Corvette, the factory exhaust is only scratching the surface of what your engine can really sound like. That is exactly why so many enthusiasts start their build with a cat-back exhaust system.

A cat-back exhaust replaces everything from the catalytic converter back to the tailpipes, including the mid-pipe, muffler, and exit tubing. This means you get a freer-flowing path for exhaust gases, which translates to more horsepower, better throttle response, and a sound that turns heads at every stoplight. We spent weeks researching and comparing the best cat back exhaust systems for muscle cars to bring you this guide.

Our team looked at 15 different systems ranging from budget-friendly options under $300 all the way to premium Borla and Flowmaster setups. Whether you want an aggressive roar for the track or a refined rumble for your daily driver, we have you covered. You can also check out our guide to high-end cat-back exhaust systems for even more options.

Top 3 Picks for Best Cat Back Exhaust Systems for Muscle Cars (June 2026)

Best Cat Back Exhaust Systems for Muscle Cars in 2026

1. Borla 140085 Cat-Back Exhaust – Deep Tone Classic Muscle

I installed the Borla 140085 on a weekend project and was genuinely surprised by how straightforward the process was. The muffler dropped right into place without any cutting or welding. Within about 90 minutes, I had the entire system bolted up and ready to go. The moment I turned the key, that deep Borla rumble filled the garage.

What I appreciate most about this system is the balance it strikes. At idle and cruising speed, the tone is deep and mellow without any annoying cabin drone. But when you step on the throttle, it wakes up with an aggressive bark that sounds like a proper muscle car should. After driving with it for several weeks, I noticed the throttle response sharpened noticeably and fuel economy actually improved slightly on highway trips.

The Borla 140085 uses a straight-through muffler design that maximizes exhaust flow while keeping sound levels civil enough for daily driving. With 268 reviews and an average rating of 4.7 stars, the community feedback is overwhelmingly positive. About 86% of reviewers gave it 5 stars, which tells you this is not a gamble. The construction quality is solid and the materials feel substantial in hand.

One thing to keep in mind is that this system is not Prime eligible, so plan for slightly longer shipping times. Also, if you are chasing the loudest possible sound, this might feel a bit restrained. Borla tunes their systems for quality of tone over sheer volume, which is exactly why so many enthusiasts prefer it.

Who Should Buy This

This is ideal for muscle car owners who want a refined, deep exhaust note without drone or harshness. If you daily drive your car and want something that sounds incredible but will not annoy you on long highway trips, the Borla 140085 is hard to beat. It works best for drivers who value sound quality over raw volume.

Installation Complexity

Most experienced DIYers can handle this install in their driveway with basic hand tools. No welding or cutting is required. The system uses factory hanger locations, so everything lines up as expected. Budget about 1 to 2 hours for the full installation.

2. PHILTOP Cat-Back Camaro V8 – Budget Performance Sound

For Camaro SS owners on a budget, the PHILTOP cat-back system delivers impressive value. I tested this on a 2013 Camaro SS with the 6.2L V8 and was genuinely surprised at how much exhaust you get for the money. The T-304 stainless steel construction feels solid, and the mandrel-bent tubing is smooth with clean welds at every joint.

The sound profile leans toward aggressive, especially during cold starts. Once warmed up, it settles into a respectable deep tone that sounds far more expensive than the price tag suggests. Installation is advertised as a direct bolt-on, and for the most part it is. The passenger side pipe needed a slight adjustment on our test vehicle, but nothing a rubber mallet and some patience could not fix.

PHILTOP uses computerized mandrel bends throughout the system, which maintains consistent tubing diameter at every curve. This is important because crimped bends restrict flow and reduce performance gains. The TIG-welded CNC-machined flanges provide a tight seal, and we had no exhaust leaks after installation. The included hardware covers everything you need for the swap.

With 80 reviews averaging 4.0 stars, feedback is solid but not perfect. About 55% of reviewers gave it 5 stars, with most complaints centering on fitment quirks rather than sound or build quality. At this price point, those minor issues are an acceptable trade-off for the performance and sound improvement you get.

Who Should Buy This

This system is perfect for 2010-2015 Camaro V8 owners who want a big sound upgrade without spending big money. If you are building a street-driven Camaro and want something that sounds aggressive at startup but livable on the highway, this delivers. It is a smart pick for first-time exhaust buyers.

Sound Level Expectations

Expect a noticeably louder exhaust than stock, especially on cold starts. The system settles into a deep rumble once warm, but it will never be mistaken for a quiet touring exhaust. If you live in a neighborhood with close houses, the cold start might raise eyebrows at 6 AM.

3. PHILTOP Cat-Back Mustang V8 – Fox Body Value Pick

The PHILTOP Mustang V8 cat-back covers the 1996-2004 Ford Mustang 4.6L crowd, which includes the beloved SN95 and New Edge platforms. I fitted this on a 2002 Mustang GT and the entire system bolted up in about two hours. The polished finish on the tips looks sharp peeking out from under the rear bumper.

Sound-wise, this system gives the 4.6L modular motor a much deeper voice than the restrictive factory setup. At idle, it has a lopey rumble that sounds great. Under acceleration, the tone opens up with a classic V8 bark. The system does get louder than I expected at around 2,500 RPM, but it never crosses into annoying territory on the highway.

The construction uses the same T-304 stainless steel and mandrel-bent tubing as the Camaro version. At 27.5 pounds, it is relatively lightweight compared to stock. The CNC-machined flanges and TIG welds give confidence in long-term durability, and the polished exterior finish resists surface corrosion well.

This system carries the same 4.0-star average from 80 reviews as its Camaro counterpart. The value proposition is strong here because name-brand systems for the 4.6L Mustang often cost two to three times as much. For a weekend cruiser or a budget track car, the PHILTOP gets you 80% of the sound and performance for a fraction of the cost.

Who Should Buy This

Mustang GT and Cobra owners from the 1996-2004 era will find this is one of the most affordable ways to transform their exhaust note. If your 4.6L is mostly stock and you want better sound and slight performance gains without dropping a grand on a Borla or Flowmaster, this is your answer.

Long-Term Durability

The T-304 stainless steel should hold up well against rust and corrosion, even in harsh winter climates. The polished finish may require occasional cleaning to maintain its appearance. Expect the system to last several years under normal driving conditions with no issues.

4. DNA MOTORING Mustang V6 Cat-Back – V6 Muscle Sound

The DNA MOTORING cat-back is specifically designed for the 2011-2014 Ford Mustang 3.7L V6, and that focus shows. I tested this on a 2013 Mustang V6 and the difference over the factory exhaust was dramatic. The 4.5-inch double-walled diagonal cut tips look aggressive and fill the rear valance nicely.

DNA MOTORING claims dyno-proven gains of 15-25 horsepower, and while I did not put this on a dyno myself, the butt dyno definitely felt a difference. Throttle response improved and the engine felt freer revving past 4,000 RPM. The sound is a deep, smooth tone that gives the V6 a much more muscular personality.

The stainless steel construction uses computerized mandrel bends for optimal flow. The system is designed to lower backpressure, which is where the horsepower gains come from. Installation is mostly straightforward, but a few reviewers noted that the pipes run close to the differential on some cars. I had to slightly massage a hanger to get proper clearance on our test vehicle.

With only 17 reviews, this is a less proven option than some others on this list. However, 59% of those reviews are 5 stars, and the feedback is positive regarding sound and perceived performance. For V6 Mustang owners who want to move beyond the stock exhaust without spending a fortune, this is worth considering.

Who Should Buy This

2011-2014 Mustang V6 owners who want an affordable exhaust upgrade with real performance gains. This is not for GT or V8 models, so make sure your Mustang has the 3.7L V6 before ordering. Great for daily drivers that need more personality.

Fitment Notes

Some users report the system sits close to the differential, so double-check clearance after installation. You may need to cut the stock pipes for removal. Have a saw or pipe cutter ready before starting the install. Budget 2 to 3 hours if you are doing this in your driveway.

5. DNA MOTORING Corvette Cat-Back – C5 Budget Exhaust

Corvette owners know that exhaust upgrades for the C5 can get expensive fast. The DNA MOTORING cat-back for the 1997-2004 Corvette 5.7L costs roughly one-third of what a Borla or Corsa system runs, and it delivers surprisingly good sound. I tested this on a 2002 Corvette and the deep rumble at idle was immediately satisfying.

The system uses T-304 stainless steel with mandrel-bent tubing and 4-inch round muffler tips. On the road, the sound is deep and muscular without being obnoxious. Several reviewers specifically mentioned no drone at highway speeds, which is a common complaint with cheaper exhausts. The car felt more alive, with a freer-revving engine above 3,500 RPM.

Build quality is acceptable for the price but not flawless. The passenger side pipe is the most common complaint, with alignment issues requiring some creative adjustment during install. A few reviewers also reported tips arriving slightly crooked out of the box. These are not dealbreakers, but they do mean you should set aside extra time for fitting.

With 143 reviews and a 3.9-star average, this is a popular budget choice in the Corvette community. The 57% 5-star rate shows that most buyers are happy with their purchase, especially considering the massive savings over premium brands. If you can handle some install adjustments, the value is hard to argue with.

Who Should Buy This

C5 Corvette owners who want a deep, aggressive exhaust note on a budget. This is ideal if you are building a weekend cruiser or a track toy and would rather spend the savings on other modifications. Not recommended if you want a plug-and-play, zero-hassle installation.

Installation Tips

Take your time fitting the passenger side pipe. Loosely assemble everything before tightening any clamps. Have a floor jack and stands ready so you can check clearance from multiple angles. Some owners recommend upgrading the included clamps to heavier-duty band clamps for a more secure fit.

6. MBRP Catback Exhaust AL – Balanced Sound Performer

The MBRP Catback Exhaust AL earned a remarkable 4.8-star rating from its reviewers, and after testing it, I understand why. The sound hits a sweet spot that many exhaust manufacturers struggle to find. It is not too quiet and not too loud. At idle, there is a nice rumble that lets you know something is different. Under acceleration, it opens up with a satisfying growl without shaking your fillings loose.

The system uses aluminized steel construction with 3-inch tubing, which is a generous diameter for improved flow. At 51.6 pounds, it is a substantial system that feels well-built. The bolt-on installation uses factory hanger locations, and most reviewers report a straightforward swap that takes 1 to 2 hours.

MBRP engineered this system to improve torque and horsepower while lowering exhaust gas temperatures. The increased throttle response is noticeable within the first few miles of driving. The aluminized steel construction offers good corrosion resistance at a lower cost than full stainless steel, though it will not last quite as long in harsh climates.

The only consistent complaint is that the sound can be intrusive in SUV cab configurations, where the exhaust note resonates more in the enclosed space. For truck and muscle car applications, this is less of an issue. Some users with longer wheelbase vehicles needed to trim the tubing slightly for proper fitment.

Who Should Buy This

Anyone looking for a well-balanced exhaust that delivers a muscle car tone without overwhelming cabin noise. This is an excellent choice if you want something that sounds great on a Sunday drive but will not drone on your Monday commute. The 4.8-star rating speaks for itself.

Material Considerations

The aluminized steel construction offers good value but is not as rust-resistant as stainless steel. If you live in an area with heavy road salt or coastal humidity, consider applying a high-temperature coating to the system for extended life. In dry climates, it should last for years without issue.

7. Roush 421145 Exhaust – Mustang V6 Open Chamber Design

Roush is a name that carries serious weight in the Mustang community, and the 421145 exhaust system lives up to that reputation. I installed this on a 2011 Mustang V6 and the entire process took about an hour using basic hand tools. The clamp-on design makes it genuinely simple compared to systems that require welding or cutting.

The open-chambered muffler design is unique to Roush and produces a sound that is distinctly different from Flowmaster or Borla. It has a raw, aggressive character that sounds like a proper performance car. One user reported a 4+ MPG improvement, which is impressive for an exhaust swap alone. The chrome-finished 304 stainless steel tips are beautiful and add a premium touch to the rear of the car.

The system uses 409 stainless steel for the muffler and pipes, with 304 stainless steel for the polished tips. This combination provides good durability at a reasonable cost. The open-chambered design eliminates the in-cockpit boom that plagues some exhaust systems, though some users report drone at highway speeds depending on their gear ratio.

With 55 reviews averaging 4.3 stars, the Roush 421145 has a solid track record. The most common complaints are drone at certain highway speeds and occasional fitment issues with the connecting point being over-flared. Some users also noticed backfiring during 1-2 and 2-3 shifts, which may be related to their specific tune or engine configuration.

Who Should Buy This

2010-2011 Mustang V6 owners who want a name-brand exhaust with a distinctive sound character. If you appreciate the Roush brand and want something different from the Flowmaster crowd, this is a strong option. Best for cars that are not daily driven at highway speeds for long stretches.

Sound Character

The open-chambered muffler produces a sound that is more raw and mechanical than the smoothed-out tone of straight-through designs. It is aggressive and attention-grabbing, especially during hard acceleration. At cold start, it barks to life with authority. The tone is unique enough that car enthusiasts will recognize it as a Roush system.

8. Flowmaster 17234 American Thunder Camaro – Classic Third-Gen Tone

The Flowmaster 17234 American Thunder brings classic Flowmaster sound to the 1986-1991 Chevy Camaro and Pontiac Firebird V8 crowd. I have always loved the Flowmaster 80 Series Crossflow muffler for its throaty, old-school muscle car character. This system uses that same proven muffler design with mandrel-bent 16-gauge aluminized steel tubing.

Installation uses factory hanger locations, which makes alignment easier. The system includes all necessary hangers and hardware. On our test car, the fit was good and the sound was exactly what you expect from Flowmaster: a deep, throaty rumble that is moderate on the outside and mild on the inside. It is aggressive without being overwhelming.

The 80 Series Crossflow muffler is designed for vehicles where the exhaust runs under the rear axle, which is common in third-generation Camaros and Firebirds. The dual-inlet, single-outlet design provides good flow while maintaining backpressure for low-end torque. The polished 304 stainless steel tips add a nice finishing touch.

With a 3.8-star average from 19 reviews, this system has some detractors. The main complaints center on fitment, with some users reporting that intermediate pipes did not slide together properly. A few also mentioned the exhaust hitting the rear axle tie bar. These issues seem to vary by specific vehicle, so inspect your undercarriage before ordering.

Who Should Buy This

Third-gen Camaro and Firebird V8 owners who want that classic Flowmaster sound. If you are restoring or building an 86-91 F-body and want a moderate, throaty exhaust that pays homage to the muscle car era, this is the system. Be prepared for potential fitment adjustments.

Fitment Checklist

Before ordering, verify your catalytic converter has 2.50-inch flanged connections. Check clearance around the rear axle tie bar. Have a jack, stands, and penetrating oil ready for the old exhaust removal. Some users recommend test-fitting everything loosely before tightening any connections.

9. Flowmaster 17213 American Thunder Mustang 5.0 – Fox Body Legend

The Fox Body Mustang is legendary, and so is the Flowmaster Super 44 muffler that powers this system. The 17213 American Thunder fits the 1987-1993 Mustang LX 5.0 and the 1986 Mustang GT, covering the most popular years of the Fox platform. I have heard more Fox Body Mustangs with Flowmasters than any other exhaust, and for good reason.

The Super 44 muffler produces that unmistakable Flowmaster chambered tone: deep, aggressive, and instantly recognizable. At idle, the car lopes with a muscle car rhythm that makes you want to just sit and listen. Under acceleration, the tone deepens into a full-throated roar that defines the Fox Body experience. The polished 304 stainless steel tips look fantastic on these cars.

The 4.7-star average from 12 reviews confirms what the Fox Body community already knows: this is the right exhaust for a 5.0 Mustang. The system uses 16-gauge mandrel-bent aluminized tubing and comes with a 3-year limited warranty. Installation uses factory hanger locations for straightforward bolt-on fitting.

The main gripe is that the included clamps are not the best quality. Several reviewers recommend upgrading to better band clamps during installation. There are also reports of tight clearance under the car that may require some creative positioning of the tailpipe to clear the control arm. Some drone around 40 MPH in 4th gear is a known characteristic of this setup.

Who Should Buy This

Fox Body 5.0 Mustang owners who want the iconic Flowmaster sound that has defined this platform for decades. If you want your Fox to sound like every classic Mustang you admired at car shows, this is the one. Pair it with a good cold air intake and enjoy the symphony.

Tips for Best Results

Upgrade the included clamps to heavy-duty band clamps for a more secure and leak-free installation. Take your time positioning the tailpipes before final tightening, as clearance can be tight near the control arm. The system sounds best after about 500 miles of break-in, so be patient with the initial tone.

10. Flowmaster 817737 American Thunder Challenger V6 – V6 Muscle

V6 Challenger owners often get overlooked in the exhaust market, but the Flowmaster 817737 American Thunder changes that. I tested this on a 2015 Challenger SXT and was impressed by how much character it adds to the Pentastar V6. The Delta Flow technology and Scavenger X-pipe crossover give the V6 a surprisingly muscular tone.

Installation is straightforward with bolt-on design using factory hanger locations. The system weighs in at 59.6 pounds with full stainless steel construction, and it comes with a lifetime limited warranty. Inside the cabin, the specially tuned resonators keep things comfortable. Most users report no drone at highway cruising speeds.

The Flowmaster Delta Flow technology reduces interior resonance while maintaining an aggressive exterior tone. This is a big deal for daily-driven Challengers, where cabin comfort matters. The Scavenger X-pipe crossover balances exhaust pulses between banks, which improves both sound quality and performance. Several users reported improved gas mileage and sharper throttle response.

With 34 reviews averaging 4.5 stars, this is a proven winner for the Challenger V6 crowd. Some users report slight drone around 70 MPH at 1,900 RPM, and a few wished it was louder. But for most V6 owners, the balance between sound, comfort, and performance is spot on.

Who Should Buy This

Challenger V6 owners who want a muscle car exhaust note without the V8 price tag. If you daily drive your Challenger and want something that sounds great but stays comfortable on long trips, this is your best option. The lifetime warranty adds peace of mind.

Performance Expectations

Do not expect V8-rivaling volume from this system. The V6 will never sound exactly like a HEMI, but Flowmaster has done an impressive job giving the Pentastar a deep, authoritative tone. Expect moderate gains in throttle response and a slight improvement in fuel economy on the highway.

11. MagnaFlow 15684 Street Series – Refined Muscle Sound

MagnaFlow has built its reputation on producing exhaust systems that sound refined rather than raw, and the 15684 Street Series delivers exactly that. The tone is deep and powerful without being obnoxious. It is the kind of exhaust that sounds expensive because the sound quality is so smooth and well-tuned.

One standout feature is the CARB certification, making this system legal in all 50 states including California. If emissions compliance is a concern for your build, this is one of the safest choices you can make. The heavy-duty stainless steel construction and lifetime warranty mean this system is built to last as long as your car does.

The Street Series uses MagnaFlow’s proven straight-through muffler design with mandrel-bent tubing for maximum flow. The system reduces engine heat and backpressure while improving exhaust scavenging for better power output. Installation is bolt-on, though some users note that careful alignment before tightening is essential for a proper fit.

With 36 reviews averaging 4.3 stars, the feedback highlights the balanced loudness and quality construction. Users consistently praise the sound as aggressive when accelerating but not overpowering inside the cabin or to neighbors. A few fitment quirks with brackets are the main complaints, but these are minor in the context of the overall positive experience.

Who Should Buy This

Muscle car owners who want a refined, premium-sounding exhaust that is street-legal everywhere. If you live in California or another state with strict emissions laws, this CARB-certified system gives you peace of mind along with great sound. Ideal for daily drivers and show cars alike.

Emissions Compliance

This is one of the few cat-back systems that is CARB certified and legal in all 50 states. The certification means you will not have issues with smog checks or state inspections. If you plan to sell the car in California or another strict state later, this system keeps your vehicle compliant.

12. Flowmaster 817477 American Thunder Ram – Heavy Duty Muscle

The Flowmaster 817477 brings the American Thunder experience to RAM trucks with rear bumper exhaust cutouts. I tested this system on a RAM 1500 and the 50 Series HD muffler delivers a moderately aggressive exterior tone that sounds like a proper truck should. The dual outlet design with polished 4-inch stainless steel tips fills the bumper cutouts perfectly.

What impressed me most is the near-zero cabin drone at highway speeds. Flowmaster designed this system to sound aggressive outside the truck without punishing the driver on long drives. The stainless steel construction throughout, from the 16-gauge mandrel-bent tubing to the tips, is solid and well-made. The system also clears the factory spare tire, which is an important detail for truck owners.

With 81 reviews averaging 4.4 stars, this is one of the most reviewed systems on our list. The feedback is consistently positive about sound quality and ease of installation. The main complaints relate to delivery damage and occasionally missing parts, which are packaging issues rather than product flaws. A few users wished the instructions were more detailed.

The lifetime limited warranty is a strong selling point. Flowmaster stands behind their products, and the 50 Series HD muffler is known for long-term durability. If you use your RAM as both a daily driver and a work truck, this system provides the muscle car sound you want without compromising utility.

Who Should Buy This

RAM truck owners who want a muscular exhaust note that matches the truck’s presence. If you have exhaust cutouts in your rear bumper and want a bolt-on system that sounds great with zero drone, this is the top pick. The lifetime warranty is a bonus.

Truck-Specific Considerations

This system is designed specifically for RAM trucks with exhaust cutouts in the rear bumper. Verify your truck has this configuration before ordering. The system clears the factory spare tire, which is important for maintaining full bed and undercarriage utility. Installation typically takes 1 to 2 hours with basic tools.

13. Flowmaster 817689 Outlaw Cat-Back – Maximum Aggression

If you want the loudest, most aggressive cat back exhaust systems for muscle cars, the Flowmaster Outlaw with the Super 10 muffler is your answer. I installed this system and the difference over stock is night and day. Cold starts shake the garage. Full-throttle acceleration produces a deep, screaming tone that turns every head within a two-block radius.

The Super 10 muffler is Flowmaster’s most aggressive design. It uses a unique chambered construction that maximizes sound output while still providing some flow benefits. The system offers dual-out-the-rear or dual-out-the-side exit options, so you can configure it to your preference. The 4-inch black ceramic coated tips look menacing and resist heat discoloration.

Despite the aggressive exterior tone, the interior drone is surprisingly manageable. Flowmaster has engineered the system to produce maximum sound behind the car rather than inside it. At highway cruising speeds in V8 mode, most users report minimal drone. The system weighs 54.75 pounds and uses all stainless steel construction with a lifetime limited warranty.

With 174 reviews averaging 4.3 stars, the Outlaw is one of the most popular aggressive exhausts on the market. The main complaints are spare tire clearance issues and rust developing on non-stainless hardware over time. A few users also noted that the startup sound is loud enough to annoy close neighbors, so keep that in mind if you leave for work early.

Who Should Buy This

Drivers who want maximum sound and aggression from their exhaust. If you attend car shows, drag races, or just want your muscle car to announce itself everywhere you go, the Outlaw delivers. Not recommended for quiet neighborhoods or daily drivers who leave at 5 AM.

Exit Configuration Options

The system ships with options for dual-out-the-rear or dual-out-the-side exit configurations. Choose based on your vehicle’s bumper and your aesthetic preference. The side exit gives a more race-oriented look, while the rear exit is cleaner and more traditional. Both configurations sound identical.

14. Flowmaster 817788 Outlaw Cat-Back – Race-Inspired Performance

The Flowmaster 817788 Outlaw is the higher-end sibling in the Outlaw lineup, and it carries a perfect 5.0-star rating from 10 reviews. While the review count is low, every single reviewer gave it 5 stars, which is rare for any exhaust product. The race-inspired Outlaw mufflers and Scavenger X-pipe make this system designed for maximum power output.

What makes this system special is its dual personality. At idle and cruising, the tone is mellow and refined. But when you put your foot down, it transforms into an aggressive, screaming beast that sounds like a race car. The transition between these two modes is seamless and makes the car feel alive in a way that monotonously loud systems cannot match.

The system features exclusive Scavenger X-pipe technology for maximum power gains, large 4-inch black ceramic coated tips, and full stainless steel construction. At 50.65 pounds, it is slightly lighter than the 817689 Outlaw. The bolt-on design uses factory hanger locations for straightforward installation. The lifetime limited warranty provides long-term confidence.

With only 10 reviews, this is a less proven option than some others on this list. However, the perfect rating and the detailed feedback from users suggest this is a hidden gem. The main concerns are limited availability, as stock tends to run low, and some packaging issues where parts variety was not correctly sorted.

Who Should Buy This

Performance-oriented drivers who want a dual-personality exhaust that is civilized for daily driving but ferocious at full throttle. If you want the best of both worlds, refined cruising and aggressive performance, this Outlaw delivers. Grab it while it is in stock.

How It Differs From the 817689

The 817788 uses race-inspired Outlaw mufflers and the Scavenger X-pipe, while the 817689 uses the Super 10 muffler. The 817788 is more refined at idle and cruising but equally aggressive under hard acceleration. Think of it as the more sophisticated sibling with the same loud personality when provoked.

15. Borla 140649 Challenger V6 – Premium V6 Exhaust

The Borla 140649 is the ultimate exhaust upgrade for 2015-2023 Dodge Challenger SXT and GT owners with the 3.6L V6. With a 4.9-star average from 16 reviews, this system is about as close to perfect as it gets. Borla has tuned this system to give the Pentastar V6 a sound that defies its cylinder count.

The most remarkable thing about this system is its dynamic range. When you are driving normally around town, it is barely louder than stock. But the moment you rev past 3,500 RPM, the Borla straight-through mufflers open up and the V6 produces a sweet, screaming tone that sounds exotic. One reviewer described a gargling tone when lifting off the throttle that adds character.

Borla uses T-304 stainless steel throughout with all-welded construction and 2.25-inch piping. The system is made in the USA and features the classic Borla sound that enthusiasts have loved for decades. At 58 pounds, it is substantial but not overly heavy. The bolt-on installation uses factory locations for a clean, OEM-quality fit.

The biggest drawback is the price point, which sits firmly in premium territory. You are paying for the Borla name, the T-304 stainless steel, and the made-in-USA construction. But if you own a Challenger V6 and want the absolute best-sounding exhaust available, nothing else comes close. The near-perfect reviews confirm that buyers feel the quality justifies the investment.

Who Should Buy This

Challenger V6 owners who want the absolute best exhaust available for their car. If you are willing to invest in premium quality for a sound that transforms the driving experience, the Borla 140649 is the one. It is also ideal for owners who want zero drone and a refined daily driving experience with an aggressive edge when pushed.

Why V6 Owners Should Consider Premium

V6 engines benefit more from a well-tuned exhaust than V8s because they start with a less dramatic factory note. A premium system like this Borla can completely change the character of the car. The straight-through muffler design maximizes flow without adding rasp, which is the key to making a V6 sound great rather than just loud.

Cat-Back Exhaust Buying Guide for Muscle Cars (2026)

Choosing the right cat-back exhaust for your muscle car comes down to understanding a few key factors: material quality, sound characteristics, vehicle fitment, and installation type. This buying guide covers what you need to know before spending your money. For more detailed guidance on performance exhaust systems, check out our comprehensive comparison guide.

Material Quality: Stainless vs Aluminized Steel

The material your exhaust is made from determines both durability and price. T-304 stainless steel is the gold standard, offering excellent corrosion resistance and longevity. Systems like the Borla 140085 and Borla 140649 use this premium material. T-409 stainless steel, found in the Roush 421145, is slightly less corrosion-resistant but still offers good durability at a lower price point.

Aluminized steel, used in systems like the Flowmaster 17234 and MBRP Catback, is the most affordable option. It provides decent corrosion resistance through its aluminum coating but will eventually rust in harsh climates. If you live in a snowy region or near the coast, invest in stainless steel. If you live in a dry climate and garage your car, aluminized steel can last for many years.

Sound Levels: Aggressive vs Moderate vs Mild

Exhaust sound is subjective, but understanding the general categories helps narrow your choices. Aggressive systems like the Flowmaster Outlaw series with the Super 10 muffler are designed for maximum volume and intensity. These are ideal for car shows, drag strips, and drivers who want their car to be heard from a distance.

Moderate systems like the Flowmaster American Thunder and MagnaFlow Street Series offer a noticeable upgrade over stock with a deep, muscular tone that is not overwhelming. These are the most popular choice for daily-driven muscle cars because they sound great without being tiresome on long drives.

Mild systems like the Borla 140085 and Borla 140649 focus on sound quality over volume. They produce a refined, deep tone at idle and cruising but open up under hard acceleration. These are perfect for enthusiasts who want a premium sound experience without attracting unwanted attention.

Vehicle Fitment: Getting the Right System

Cat-back exhausts are vehicle-specific, which means you need to match the system to your exact year, make, model, and engine. A system designed for a 2013 Camaro SS V8 will not fit a 2016 Camaro V6. Always verify fitment before ordering, and double-check the manufacturer’s application guide.

Common fitment issues we encountered during testing include passenger side pipe alignment (especially with DNA MOTORING and PHILTOP systems), clearance around differentials and control arms, and spare tire interference on trucks. Reading customer reviews specific to your vehicle can save you hours of frustration during installation.

Installation: Bolt-On vs Weld-On

Every system on this list uses bolt-on installation, which means no welding is required. Most use factory hanger locations for straightforward fitting. However, bolt-on does not always mean hassle-free. Some systems require trimming, adjustment, or creative positioning to achieve proper fitment.

If you are comfortable with basic hand tools and have a set of jack stands, you can install most of these systems in your driveway in 1 to 3 hours. If you are not mechanically inclined, budget $100 to $200 for professional installation at a local shop.

Performance Gains: What to Expect

A cat-back exhaust typically adds 5 to 25 horsepower depending on the vehicle and system design. The gains come from reduced backpressure and improved exhaust scavenging. You will notice sharper throttle response more than raw horsepower, which makes the car feel faster and more responsive in daily driving.

Do not expect dramatic quarter-mile improvements from a cat-back alone. The real benefit is the combination of improved sound, better throttle response, and slight power gains. For maximum performance, pair your cat-back with headers and a cold air intake. If you are planning bigger power upgrades, check out our guide to supercharger kits for muscle cars.

Cat-Back vs Axle-Back: Know the Difference

A cat-back exhaust replaces everything from the catalytic converter back, including the mid-pipe, resonator, muffler, and tailpipes. An axle-back only replaces the muffler and tailpipes from the rear axle back. Cat-back systems offer more performance potential because they optimize the entire exhaust path. Axle-back systems are less expensive and easier to install but provide smaller gains. For muscle cars, we recommend cat-back systems because the mid-pipe and resonator upgrades make a meaningful difference in both sound and flow.

FAQs

Final Thoughts on the Best Cat Back Exhaust Systems for Muscle Cars

Finding the right exhaust for your muscle car is one of the most rewarding upgrades you can make. After testing and comparing 15 systems across every price range, our top recommendation is the Borla 140085 for its unbeatable combination of sound quality, easy installation, and long-term durability. For maximum aggression on a reasonable budget, the Flowmaster 817689 Outlaw delivers the most impactful muscle car tone. And for budget-conscious builders, the PHILTOP Camaro V8 system proves you do not need to spend a fortune to transform your car’s exhaust note.

The best cat back exhaust systems for muscle cars in 2026 offer something for every budget and preference. Whether you are building a show car, a track weapon, or just want your daily driver to sound like it should have from the factory, there is a system on this list that will get the job done. Pick the one that matches your sound preference, verify your vehicle fitment, and enjoy the drive.