Mishimoto Stainless Steel 3inch Cat Back Exhaust System

2015-2020 Subaru WRX & STI

Ships for free in the 48 states

SKU: MMEXH-WRX-15We price match!

Out of Stock

The engineers at Mishimoto designed this cat-back as a four-piece design with precision TIG welded 304 Stainless Steel. This allows a smooth exhaust flow from the 3.0" 2-bolt exhaust flange all the way through the 2.25" y-section. To top it off, this cat-back includes two 2.25" V-Band clamps, a 3" exhaust band clamp, a new 3" 2-bolt flange gasket, and all stainless steel hardware, so you don’t have to worry about your hardware rusting ever again!
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  • Direct fit for the 2015-2020 Subaru WRX & STI
  • Extremely aggressive turbo and exhaust tone under acceleration and boost
  • Designed with oval mufflers to prevent highway drone
  • Installs in under an hour
  • Quad 3.5" staggered double wall polished tips
  • Full 304 stainless steel mandrel-bent construction
  • Dyno-proven maximum gains of up to 9 whp and 8 wtq and peak gains of up to 4 whp and 3 wtq using 93 octane fuel while maintaining safe AFRs on the stock tune (2015 WRX w/ CVT)
  • TIG welded to perfection
  • 3" to 2.25" exhaust split helps maintain proper exhaust velocity
  • Mates with the Mishimoto, stock, or most aftermarket downpipes
  • Made in the USA
  • Mishimoto Lifetime warranty

Give your 2015-2020 WRX or STI an Aggressive Exhaust Note

The Mishimoto Stainless Steel 3inch Exhaust System for the 2015-2020 Subaru WRX & STI cat-back exhausts allows your entire system to breathe easier, providing horsepower, torque, and a rich exhaust tone. Stainless steel construction, an easy install, and dyno-proven gains, these exhausts are Mishimoto's solution to your stock system's lack of aggressive tone with an added performance bonus.

Outstanding Build Quality

For a good balance of price and performance, Mishimoto’s Exhaust is constructed with high-quality SUS304 stainless steel, CNC-machined flanges, and manufactured with a polished finish. Each system features mandrel-bent stainless-steel piping for maximum exhaust flow and reduced back pressure. These exhausts are engineered to produce strong mid to top-end power gains, as well as an increase in horsepower and torque.


  • 2015-2020 Subaru WRX
  • 2015-2020 Subaru STI

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  1. Love it

    By John October 10, 2017

    Iv been running this for a few months. love the sound and easy to install. cant go wrong with this one.

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