Best Evo X Cat-Back Exhaust (2008-2015): 5 Compared

The best Evo X cat-back exhaust does three things at once: it frees up airflow behind the turbo, drops meaningful weight over the heavy factory system, and gives the 4B11T the rally-bred snarl it always deserved. The 2008–2015 Mitsubishi Lancer Evolution X (chassis code CZ4A) left the factory with 291–295 hp and 300 lb-ft of torque in U.S. GSR and MR trim, and a restrictive, 40-plus-pound stock exhaust is one of the first things enthusiasts throw away. At NLP Performance in Tampa, FL, the Evo X remains one of the most-requested exhaust fitments we ship — so we lined up five of the most popular cat-back systems we stock, from HKS, Invidia, Borla, and COBB, and broke down the piping, tips, sound, and price of each.

Why Upgrade the Evo X Cat-Back Exhaust?

A cat-back exhaust replaces everything from the catalytic converter back — mid-pipe, resonator, muffler, and tips. On the Evo X, the stock 4B11T runs a small-diameter, heavily silenced system that adds back-pressure and weight. Swapping to a mandrel-bent aftermarket cat-back typically sheds 10–20 lb, sharpens throttle response, and adds a modest 5–12 wheel horsepower on an otherwise stock car. The real transformation shows up once you add a downpipe, intake, and an accessport tune: the cat-back stops being the bottleneck and lets the twin-scroll-ready 4B11T breathe.

Just as important is character. The Evo X is an AWD, S-AWC-equipped 2.0L four that revs hard to its 7,000 rpm redline. A larger 3-inch system with straight-through mufflers delivers the aggressive, raspy note the tuner crowd loves, while a resonated or dual-canister design keeps it civil for daily driving. Below, we sort the five systems by exactly that trade-off.

How We Compared the 5 Evo X Cat-Backs

Every system here is a direct bolt-on for the CZ4A Evo X, uses stainless construction, and is in stock at NLP Performance. We ranked them on four buyer-critical factors: piping diameter and flow (how well it supports power), tip style and material, sound character (street-friendly to track-loud), and price. The quick-reference table below puts all five head-to-head; detailed write-ups with pros and cons follow.

The 5 Best Evo X Cat-Back Exhausts Compared

1. HKS Hi-Power SPEC-L2 — Best Overall

The HKS Hi-Power SPEC-L2 is the best all-around cat-back for the 2008–2015 Evo X. It uses corrosion-resistant SUS304 stainless steel and a signature 94mm burnt-tip finish, and its SPEC-L (Sound Pressure Level) tuning drops cabin drone versus HKS's louder systems while keeping a deep, purposeful tone at wide-open throttle. It is the priciest system here at $1,764.00, but it is also the most refined — the pick for owners who daily their Evo and want quality that lasts.

2. Invidia Q300 Titanium Tip — Best Value

The Invidia Q300 is the best value Evo X cat-back, pairing a full 76mm (3-inch) SUS304 stainless system with a striking 110mm rolled titanium-burnt dual tip for $1,469.97. Its resonated design keeps the note moderate at cruise, then opens up under boost — a great match for a bolt-on Evo X running an intake, downpipe, and accessport tune. The double-wall titanium tips resist discoloration and give the car a premium, showroom-ready rear end.

3. Borla S-Type Cat-Back — Best Sound

If sound is your priority, the Borla S-Type is the pick. Built from patented T-304 austenitic stainless steel and weighing less than half of the factory system, it produces Borla's signature aggressive-yet-refined note — deep at idle, snarling under boost, and drone-managed thanks to Borla's straight-through, computer-modeled muffler design. At $1,149.99 it undercuts the HKS and Invidia systems while carrying a million-mile warranty against defects, and it stays emissions-friendly for street-driven Evo X builds.

4. COBB SS 3″ Quad-Tip — Best for Big Power

The COBB Stainless Steel 3-inch Quad-Tip is the best cat-back for a big-turbo or high-boost Evo X. Its 3-inch main pipe smooths into dual 2.5-inch tailpipes and finishes in four polished tips, so it flows more than any other system here — ideal once you are pushing past stock power. At $995.00 it is also one of the most affordable full systems, and it slots seamlessly into a COBB-tuned Stage package. Expect a loud, unmistakably aggressive tone.

5. HKS Racing Muffler — Loudest / Track Pick

The HKS Racing Muffler is the loudest, lightest, and most affordable system in this lineup at $864.00. Built from SUS304 stainless with a single large-bore outlet and minimal silencing, it is engineered for track and time-attack Evo X builds where every ounce and every decibel of flow counts. It is emphatically not a quiet daily-driver exhaust — but for a dedicated 4B11T track car, nothing here is more purpose-built.

How Much Power Does a Cat-Back Add on the Evo X?

On a stock-turbo Evo X, a cat-back exhaust alone typically adds 5–12 wheel horsepower, along with quicker throttle response and 10–20 lb of weight savings. The 4B11T's real restriction lives in the downpipe and factory catalytic converter, so the cat-back's biggest gains come once it is paired with a high-flow downpipe, an intake, and an accessport tune — at which point a 3-inch system like the Invidia Q300 or COBB quad-tip stops choking the setup. Owners chasing 400-plus wheel horsepower on a bigger turbo should run a full 3-inch turbo-back to see the cat-back's full potential.

Which Evo X Exhaust Is Right for You?

Match the system to how you drive. For a daily-driven, mostly stock Evo X where quality and a livable tone matter most, the HKS Hi-Power SPEC-L2 is the best overall choice. For the best value on a bolt-on car, the Invidia Q300 gives you full 3-inch flow and titanium tips for under $1,500. Chasing the meanest street sound? The Borla S-Type delivers it with a million-mile warranty. Building a high-boost monster? The COBB 3-inch quad-tip flows the most for the money. And for a dedicated track car where noise rules do not apply, the HKS Racing Muffler is the lightest, loudest, and cheapest way to breathe.