MagnaFlow Exhaust Systems

For WRX, STI, GR Corolla, and Nissan Z owners shopping exhaust, MagnaFlow is one of the best-known names in the game. Its straight-through muffler design keeps backpressure low, the tone deep, and the stainless-steel construction built to survive winters — all while staying civil enough for daily driving. If you want proven power gains with a refined, non-raspy exhaust note, this is where you start.

Exhaust upgrades come in three flavors, and this collection covers all of them. A cat-back replaces everything from the catalytic converter back for the biggest sound and power change. An axle-back only swaps the rear muffler section — cheaper, quieter, and easy to install in a driveway. Direct-fit catalytic converters replace a failing or restrictive factory cat without cutting or welding. Across all three, look for mandrel-bent tubing, TIG welds, and stainless steel; California drivers should stick to CARB-compliant converter part numbers, which MagnaFlow labels clearly.

MagnaFlow built its reputation on the straight-through, perforated-core muffler — a design that flows better than chambered mufflers and produces the brand's signature deep tone. The Competition Series cat-backs and axle-backs in this collection are the aggressive end of the lineup: louder, lighter, and tuned for turbocharged platforms like the VB WRX. The NEO series, developed for newer cars like the GR Corolla, balances sportier sound with refined cruising manners. MagnaFlow also makes direct-fit catalytic converters in Federal and California-grade versions.

Shopping around? Invidia is the JDM exhaust specialist — titanium-tip systems like the N1 and Q300 have been WRX and STI staples for years, with an aggressive look and sound to match. AWE Tuning takes a different approach: its Touring and Track editions use 180 Technology drone-canceling resonators, so the cabin stays quiet at cruise even on loud setups. MBRP rounds out the value end of the shelf with straightforward bolt-on systems for turbo platforms. Browse the full cat-back collection to compare systems side by side.

Two standouts: the MagnaFlow Competition Series Cat-Back for the 22-26 WRX is the go-to for VB owners who want the full sound and flow upgrade, and the OEM-grade direct-fit converter for the 15-19 WRX keeps a stock-sounding car emissions-legal. Our Top 5 cat-back exhausts for the 2022+ WRX guide compares sound, power, and daily manners across brands.

Do I need a tune after installing a cat-back or axle-back?

No. Cat-back and axle-back systems don't change airflow enough to require tuning — a tune only becomes necessary when you touch the downpipe or J-pipe on a turbo car. Check your year and model for the right part number.

Will a MagnaFlow Competition Series drone on the highway?

Some cabin resonance is normal with any straight-through system, especially under load. Cruising drone is modest on the VB WRX but louder than stock — if you want near-stock cruising volume, look at Touring-style systems instead.

Are the direct-fit catalytic converters legal in California?

MagnaFlow sells both Federal and California-grade converters; only the California-grade part numbers are CARB-compliant for use in California. Match the part number to your state's rules before ordering.

How hard is the install?

Axle-backs are a driveway job — a few bolts and hangers, usually under an hour. Cat-backs take longer but still bolt to factory points with no cutting. Converters are similarly direct-fit, though rusted factory hardware can fight back.