Mishimoto Stainless Steel Cat Back Exhaust - 2015-2021 Subaru WRX/STI
Mishimoto Stainless Steel Cat Back Exhaust - 2015-2021 Subaru WRX/STI
Mishimoto
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PRODUCT DETAILS
RallySport Direct proudly carries a great selection of both performance and cooling upgrades brought to you by Mishimoto.
Here, you are looking at the Mishimoto Stainless Steel Cat-Back Exhaust System. This is a high-performance cat-back exhaust system designed with smooth bends that are combined with an increased piping diameter. The result is an increase in both horsepower and torque, all while producing an aggressive exhaust note.
DETAILS:
- Direct fitment
- Dyno-proven maximum gains of up to 9 WHP and 8 WTQ and peak gains of 4 WHP and 3 WTQ using 93 octane fuel while maintaining safe AFRs on a stock tune
- Extremely aggressive turbo and exhaust tone under acceleration and boost
- Mates with the Mishimoto, stock, or most aftermarket downpipes
- Designed with oval mufflers that prevent highway drone
- Quad 3.5" staggered double-wall polished tips
- 304 stainless steel mandrel-bent construction
- 3" to 2.25" exhaust split helps maintain proper exhaust velocity
- TIG-welded
- Includes v-band clamps, hardware, and gasket
WHY WE CARRY THIS
We only list parts we’d run ourselves or recommend to a friend building a real car. If it feels vague, unverified, or inconsistent, it doesn’t make the cut.
- Fitment-first mindset — no “universal” roulette
- Brand reputation matters — we favor proven manufacturing
- Support that actually responds with real answers
WHAT TO EXPECT
This is the clean path: correct fitment, clean install, and results that match the intent.
- Install-ready experience with correct mounting where provided
- Finish that holds up to real driving, not just photos
- Selections on this page drive the exact fitment shipped
TRUST, BUILT INTO THE PROCESS.
Anyone can list parts. We curate what belongs on a serious build. Our goal is simple: fewer surprises, cleaner installs, and confidence when you hit “Buy.”
Fitment checked
We prioritize vehicle-specific listings and clear selection logic so you’re not gambling on compatibility.
Brand discipline
Proven manufacturing and consistent quality matter more than hype. We bias toward what actually holds up.
Real support
If you have a question, you’ll get a human answer that helps you finish the build — not a copy-paste shrug.
RallySport Direct proudly carries a great selection of both performance and cooling upgrades brought to you by Mishimoto.
Here, you are looking at the Mishimoto Stainless Steel Cat-Back Exhaust System. This is a high-performance cat-back exhaust system designed with smooth bends that are combined with an increased piping diameter. The result is an increase in both horsepower and torque, all while producing an aggressive exhaust note.
DETAILS:
- Direct fitment
- Dyno-proven maximum gains of up to 9 WHP and 8 WTQ and peak gains of 4 WHP and 3 WTQ using 93 octane fuel while maintaining safe AFRs on a stock tune
- Extremely aggressive turbo and exhaust tone under acceleration and boost
- Mates with the Mishimoto, stock, or most aftermarket downpipes
- Designed with oval mufflers that prevent highway drone
- Quad 3.5" staggered double-wall polished tips
- 304 stainless steel mandrel-bent construction
- 3" to 2.25" exhaust split helps maintain proper exhaust velocity
- TIG-welded
- Includes v-band clamps, hardware, and gasket
