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The 1% Award · Auto Parts Store of the Year 2026
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  • Mishimoto [15 - 21 WRX/STI] Stainless Steel Cat Back Exhaust | MMEXH - WRX - 15 - JDMuscleCat Back Exhaust SystemMIMMMEXH-WRX-15
  • Mishimoto [15 - 21 WRX/STI] Stainless Steel Cat Back Exhaust | MMEXH - WRX - 15 - JDMuscleCat Back Exhaust SystemMIMMMEXH-WRX-15
  • Mishimoto [15 - 21 WRX/STI] Stainless Steel Cat Back Exhaust | MMEXH - WRX - 15 - JDMuscleCat Back Exhaust SystemMIMMMEXH-WRX-15

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Stainless Steel Cat-Back Exhaust

Fits: 15-21 WRX/STI

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Auto Parts Store of the Year 2026

Mishimoto Stainless Steel Cat-Back Exhaust
Fits: 15-21 WRX/STI
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Fitment

Please Note: Direct fit for 2015-2021 Subaru WRX and WRX STI (manual and CVT) Mishimoto part number: MMEXH-WRX-15
  • 2015–2021 Subaru | WRX STI
  • 2015–2021 Subaru | WRX

Description

Mishimoto's 3-inch stainless steel cat-back for the 2015-2021 Subaru WRX and WRX STI frees up flow for more horsepower, torque, and an aggressive turbo exhaust tone. Oval mufflers keep highway drone down while quad 3.5-inch staggered, double-wall polished tips finish the look, and the TIG-welded 304 stainless system installs in under an hour.

  • Direct fit for 2015-2021 Subaru WRX and WRX STI (manual and CVT)
  • Dyno-proven gains of up to 9 whp and 8 wtq (93 octane, stock tune)
  • Quad 3.5 in. staggered, double-wall polished tips
  • Full 304 stainless steel, TIG-welded construction
  • Oval mufflers designed to prevent highway drone
  • Mates with stock or most aftermarket downpipes
  • Hardware, V-band clamps, and gasket included
  • Mishimoto Lifetime Warranty
  • Mishimoto part number: MMEXH-WRX-15

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