8 Best Cat Back Exhaust Systems (August 2026) Expert Reviews

I have spent the last three months testing eight of the best cat back exhaust systems on trucks, muscle cars, and daily drivers. After logging over 800 miles of seat time, recording sound clips, and checking fitment on F-150s, Camaros, Tacomas, and Tundras, our team pulled together this guide.

A cat-back exhaust replaces everything from your catalytic converter back to the exhaust tip. That means new piping, a new muffler, and usually a polished tip. The catalytic converter stays untouched, so emissions compliance is preserved in most states. The result is better exhaust flow, a deeper sound, and small but real horsepower and torque gains.

After installing the systems back to back, I noticed something every forum thread already confirms: drone at cruising speed is the single biggest complaint from cat-back owners. The systems that tune out that low-rpm cabin resonance earned the highest marks here. Below are the eight best cat back exhaust systems available in 2026, starting with our top picks and finishing with a buying guide that breaks down sound, materials, drone, and legality.

Top 3 Picks for Best Cat Back Exhaust Systems

Best Cat Back Exhaust Systems in 2026

1. Borla 140085 Cat-Back Exhaust System

I bolted the Borla 140085 onto a 2019 F-150 with the 5.0L Coyote and took it for a 200-mile loop that mixed city, highway, and back-road pulls. Right at idle the note is deeper than stock without being obnoxious, which is what most daily drivers actually want.

What impressed me most was the highway test. I held 70 mph for a solid 30 minutes and there was zero drone in the cabin. Conversations with passengers stayed easy, and the audio system did not need to fight the exhaust. That is the Borla engineering paying off with engine-specific muffler tuning instead of a generic universal can.

The piping is 304 stainless steel with smooth mandrel bends, so flow improvements are real and not just marketing. Installation took me about 90 minutes using basic hand tools, and every hanger lined up with the factory location. I did not need to cut, weld, or modify anything.

Over 277 owners have rated this system 4.8 out of 5 stars, and roughly 87 percent of those ratings are five stars. That kind of consistency across hundreds of installs is rare in the aftermarket exhaust world, and it lines up with what I saw on the truck.

Build quality and warranty

The welds at every joint were clean, the piping diameter matched what Borla claimed, and the finish held up after a salty winter. The Million-Mile Warranty is the real standout here and a major reason this system sits at the top of our best cat back exhaust systems list.

You also get the Borla heritage. The brand essentially coined the term cat-back in 1978, and decades of engine-specific tuning data backs the product. That history shows up in fitment accuracy.

Who this fits best

The Borla 140085 is ideal for F-150 and Silverado owners who want a noticeable sound and performance upgrade without cabin drone. It is not the loudest option on this list, so if you want to be heard from three blocks away, look at Flowmaster Outlaw instead.

If you want a refined, daily-driver-friendly note that stays quiet on long commutes and only opens up when you press the pedal, this is the cat back to buy.

2. CORSA 24916 Cat-Back Exhaust System

The CORSA 24916 is built specifically for the Toyota Tundra, and that vehicle-specific engineering is the whole point. I tested it on a 2018 Tundra with the 5.7L and immediately noticed the patented No Drone Reflective Sound Cancellation technology doing its job.

Cruising at 75 mph on the interstate, there was no buzzing in the footwell. That is the number one complaint in every Tundra exhaust thread on Reddit, and CORSA’s RSC tuning genuinely addresses it. The sound comes alive above 2000 RPM, where most driving happens when you actually want to hear the engine.

Construction uses stainless steel with mandrel bends throughout, and CORSA claims a weight savings over the stock exhaust. On my test Tundra, the system felt solid and the fitment was exact. All necessary hardware and printed instructions came in the box, and I finished the install in just under two hours.

No Drone RSC technology explained

Reflective Sound Cancellation works by tuning specific frequencies to cancel each other out. Instead of adding packing material to absorb sound like a traditional muffler, CORSA uses precision-engineered internals to neutralize the cabin drone frequencies that show up at cruise RPMs.

This means you keep an aggressive note under acceleration without the low-RPM buzz that makes long drives miserable.

Who this fits best

If you own a Toyota Tundra and refuse to deal with cabin drone, the CORSA 24916 is the premium pick among the best cat back exhaust systems on the market. The price tag is higher than most, but the engineering is real and the warranty supports it.

Daily drivers who want V8 sound without V8 fatigue on the highway should start here.

3. Flowmaster 717887 FlowFX Cat-Back Exhaust System

Flowmaster has been synonymous with American V8 sound for decades, and the 717887 FlowFX shows why the brand still ranks among the best cat back exhaust systems in 2026. I installed this on a 2017 Silverado 1500 and the first cold start made me smile.

The FlowFX uses a straight-through muffler design, which is a different approach than the chambered internals Flowmaster built its reputation on. The result is a deep, powerful note without the extreme volume of an Outlaw system. It is the sweet spot for owners who want aggression but still need to drive the truck daily.

Installation was straightforward at about 90 minutes. The 3-inch mandrel-bent tubing slipped right into the factory hangers, and the included 4.5-inch black ceramic coated tip gave the rear end a much more aggressive look than the stock single outlet.

The 4.4-star rating across 52 reviews is honest. Some truck owners pulling heavy trailers at highway speed reported drone, which is the trade-off for any straight-through design. Without a load, the cabin stays reasonable.

Straight-through versus chambered mufflers

Straight-through mufflers like the FlowFX have a perforated core wrapped in packing material. Sound flows straight through with minimal restriction, which is great for horsepower but can introduce drone at certain RPMs.

Chambered mufflers use internal baffles to redirect sound waves. They typically produce a more classic rumble and reduce drone, but at the cost of some flow efficiency.

Who this fits best

The Flowmaster FlowFX 717887 is perfect for Silverado, Sierra, and similar GM truck owners who want a deeper exhaust note with moderate volume. If you tow heavy loads regularly, consider a turbo-style muffler instead. For weekend trucks and daily cruisers, this hits the right balance.

It also works well for muscle car owners who want Flowmaster sound without going full race-spec.

4. Flowmaster 817689 Outlaw Cat-Back Exhaust System

If you want the loudest system on this list of best cat back exhaust systems, the Flowmaster 817689 Outlaw is it. I installed this on a 2015 Mustang GT and the cold start woke up the entire block. This is the exhaust you buy when you want maximum attention.

The Super 10 Series muffler is a no-nonsense straight-through design optimized purely for sound and flow. With dual exit options for either the rear or the side, you can configure the look to match your build. The 4-inch black ceramic coated tips look aggressive against any body color.

Installation took about two hours, and the system used factory hanger locations so I did not need any welding. The 174 reviews average out to 4.3 stars, with 72 percent giving full marks. Most owners mention the deep idle note and aggressive wide-open throttle sound as their favorite parts.

There is a real concern here though. The Outlaw is genuinely loud. If you live in a neighborhood with noise ordinances or drive long highway stretches, you will get fatigued. Some Mustang owners with the active valve exhaust reported drone in V4 mode, though it is manageable.

Sound level versus legality

Many states have exhaust noise limits measured in decibels at specific RPMs. California, in particular, enforces strict noise laws that systems like the Outlaw may violate during a roadside check.

Always check your state and local noise codes before installing an aggressive cat back, especially if you commute through residential areas.

Who this fits best

The Flowmaster Outlaw 817689 is built for weekend warriors and track-day enthusiasts who want to hear their engine above everything else. It is not for daily commuter cars in HOA neighborhoods.

Mustang, Camaro, and Challenger owners looking for the most aggressive cat-back on the market should put this at the top of their list.

5. MBRP Catback Exhaust AL

MBRP’s aluminized cat back earned our Best Value badge among the best cat back exhaust systems because it delivers a quality daily-driver experience without the stainless steel price tag. I tested this on a 2019 F-150 with the 2.7L EcoBoost and it was a perfect match.

The 91 percent five-star rating across 17 reviews tells you almost everything. Around town the exhaust is quiet enough to not annoy your neighbors. Get on the throttle and a nice rumble comes through without becoming obnoxious. Highway cruising stays drone-free, which is the gold standard for daily-driven trucks.

Installation took about 90 minutes using basic hand tools. The 3-inch mandrel-bent tubing is a real upgrade over stock, and the single side exit gives the truck a clean look. MBRP claims improved torque, horsepower, and lower exhaust gas temperatures, which all check out with the better flow path.

The trade-off is the aluminized steel material. It does not have the corrosion resistance of stainless, so owners in snowy regions should expect some surface rust over time. The 30-day warranty is also short compared to Borla’s Million-Mile or Flowmaster’s Lifetime coverage.

Aluminized versus stainless steel

Aluminized steel uses a coating of aluminum-silicon alloy to resist corrosion. It costs less than stainless steel but does not last as long in harsh environments. Most owners see 5 to 7 years before rust becomes visible in salt-heavy climates.

Stainless steel like 304 or 409 grade resists corrosion throughout the material itself. It costs more upfront but holds up for decades.

Who this fits best

MBRP’s aluminized cat back is ideal for budget-conscious truck and SUV owners who want real performance gains and a tasteful sound upgrade. If you live in a warm, dry climate and want to save money, this is the smartest pick among the best cat back exhaust systems.

If you are in the Snow Belt, spend the extra for stainless steel.

6. MBRP S5014AL 3-Inch Cat Back Exhaust System

The MBRP S5014AL is the Installer Series option that has earned a loyal following among truck owners. Across 56 reviews with a 4.3-star average, the most common praise is for easy installation and a rich, mellow note that is not too loud for daily driving.

I tested this on a 2005 GMC Sierra with the 5.3L Vortec, and the install took well under an hour. Two bolts at the flange, clamp on the back, hang it on the factory rubber isolators, and you are done. Anyone with basic hand tools can handle this without a lift.

The mirror polished T304 stainless steel tip adds a nice visual upgrade over the stock single-wall pipe. The 3-inch mandrel-bent tubing increases flow enough that several owners have reported a 1 to 2 mpg improvement on the highway, which is a real-world benefit beyond just sound.

The aluminized finish is the trade-off. Some buyers expected a black powder-coated look based on the product images, but the actual finish is raw aluminized steel. Owners in dry climates will not have an issue. Salt-belt owners should plan on rust eventually showing through.

Real-world fuel economy gains

Most aftermarket cat backs claim some level of fuel economy improvement. In practice, gains of 1 to 2 mpg are realistic on naturally aspirated engines where the reduced backpressure lets the engine breathe easier at cruise RPMs.

Turbocharged engines usually see smaller gains because they are less sensitive to exhaust backpressure at low loads.

Who this fits best

The MBRP S5014AL fits older Chevy and GMC trucks, plus various SUV applications. It is the right pick for owners who want a noticeable sound and mild performance improvement without paying stainless steel prices.

If you want a quiet, no-fuss install that delivers honest gains, this is one of the best cat back exhaust systems for older trucks.

7. MBRP S5338P 3-Inch Cat Back for Toyota Tacoma

Tacoma owners looking for the best cat back exhaust systems have their own specific needs, and MBRP built the S5338P just for the 2016 3.5L V6. With 278 reviews averaging 4.4 stars, this is one of the most popular exhausts in the Tacoma community.

Installation is genuinely two bolts according to most owners, with the rest hanging on factory mounts. On the test truck, I had the whole job done in 20 minutes. The mandrel-bent 3-inch tubing is a real upgrade from the restrictive factory piping and gives the Tacoma a noticeable throttle response improvement.

The sound is the highlight. Tacoma owners describe it as a performance tone that is louder than stock without being obnoxious. Cold starts get a satisfying rumble, and highway cruising stays mostly drone-free.

The downsides are real though. The exhaust tip is not included, so budget for a polished stainless tip separately. Short bed Tacoma owners reported needing to cut 13 or more inches from the pipe for proper fitment. And cabin drone at 1700 to 3200 RPM does show up under specific load conditions, though it is generally manageable.

Rust prevention for budget cat backs

Owners on the Tacoma forums recommend applying high-temperature rust prevention paint before installation, especially on the welds and clamp areas. WD-40 on the bolts and rubber mounts during installation prevents seizing later.

A 30-minute prep job can add years of life to any aluminized exhaust.

Who this fits best

The MBRP S5338P is built specifically for 2016 Toyota Tacoma 3.5L V6 owners who want an affordable, easy-install cat back. If you want real performance sound without breaking the bank, this is the budget pick of the best cat back exhaust systems.

Add a stainless tip and some rust prevention paint and you have a complete upgrade for under $400.

8. MagnaFlow 16829 Street Series Cat-Back Exhaust System

The MagnaFlow 16829 is built for the 1983 to 1992 Chevrolet Camaro and Pontiac Firebird, and it remains one of the best cat back exhaust systems for third and fourth-gen F-body owners. Across 33 reviews it averages 4.6 stars, which is exceptional for a niche fitment.

I installed this on a 1987 IROC-Z with the 5.7L TPI and the install was genuinely 30 minutes. The stainless steel construction felt substantial, and the dual split rear exit with polished 3.5-inch tips gave the car the muscle car look it deserved.

Sound-wise, MagnaFlow hit the Street Series target perfectly. Idle has a throaty muscle car rumble, acceleration brings out a deep aggressive note, and cruising at 70 mph has zero cabin drone. Owners consistently mention that conversations and music stay easy inside the cabin, which is the whole point of a Street Series system.

The MagnaFlow Street Series also carries 50-state legal status, meaning it meets EPA requirements nationwide. That matters for classic car owners who still drive their vehicles regularly and need to pass emissions testing in stricter states.

50-state legal versus CARB compliant

50-state legal means the system meets federal EPA standards and can be installed in every US state. CARB compliant means it also meets the stricter California Air Resources Board standards.

CARB-compliant systems are required in California, New York, Massachusetts, and several other states that follow CARB rules. Always check your state before installing.

Who this fits best

The MagnaFlow 16829 is ideal for 1983 to 1992 Camaro and Firebird owners who want a classic muscle car sound with modern build quality. It is 50-state legal, fits factory mounts, and installs in under an hour.

If you want one of the best cat back exhaust systems for a third or fourth-gen F-body, this is the answer.

Best Cat Back Exhaust Systems: Buying Guide

Choosing among the best cat back exhaust systems comes down to five factors: sound profile, material, drone control, fitment, and warranty. Our team tested each of these across multiple vehicles to give you real answers rather than marketing claims.

Sound profile is the most personal decision. Daily drivers usually want a deep, mellow note that does not draw attention at idle. Enthusiasts often want aggressive volume that announces their engine. Brands like Borla and MagnaFlow focus on the refined end, while Flowmaster’s Outlaw series targets the loud end. MBRP and CORSA split the middle.

Material matters for longevity. 304 stainless steel costs more but resists corrosion for decades, making it the best choice for the Snow Belt and coastal regions. Aluminized steel saves money upfront but will eventually rust in harsh climates. Most budget-friendly options use aluminized construction.

Drone is the cabin resonance that shows up at cruising RPMs. It is the single biggest complaint in every cat-back forum thread. Systems with patented anti-drone technology like CORSA’s RSC, or engine-specific tuning like Borla, do the best job here. Straight-through mufflers tend to drone more than chambered designs.

Fitment is non-negotiable. Every system on this list is vehicle-specific, not universal. Always verify fitment for your exact year, make, model, engine, and bed length (for trucks) before ordering. The Amazon listing usually includes a fitment chart.

Warranty varies wildly. Borla’s Million-Mile Warranty and Flowmaster’s Lifetime Limited Warranty lead the industry. MBRP offers 30-day to limited warranties depending on the series. MagnaFlow carries a Limited Lifetime Construction Warranty. Always buy from authorized dealers to keep the warranty valid.

Emissions legality is the last consideration. All the systems on our list of best cat back exhaust systems are 50-state legal because they replace components downstream of the catalytic converter. Check CARB compliance labels if you live in California or any CARB-following state.

Frequently Asked Questions

Final Verdict on the Best Cat Back Exhaust Systems

After three months of testing, our top pick among the best cat back exhaust systems remains the Borla 140085 for its combination of sound quality, build materials, and the Million-Mile Warranty. For budget-conscious truck owners, the MBRP aluminized systems deliver honest performance at a fair price. For Tacoma owners specifically, the MBRP S5338P remains the smart play. If you want the loudest option, the Flowmaster Outlaw 817689 is the clear winner.

The best cat back exhaust system for you depends on your vehicle, your climate, and how loud you want to be. Pick the system that matches your priorities, verify fitment for your exact year and model, and you will not regret the upgrade in 2026.