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Cat-Back Exhaust, fits Subaru WRX/STI 2015-2021

Model
MMEXH-WRX-15
Sale Price $985.96 Regular Price $1,287.24
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Key Features
Features
  • Direct fit for the 2015-2021 Subaru WRX/STI
  • 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)
  • Extremely aggressive turbo and exhaust tone under acceleration and boost
  • Mates with the Mishimoto, stock, or most aftermarket downpipes
  • Installs in under an hour
  • Designed with oval mufflers to prevent highway drone
  • Quad 3.5-in staggered double wall, polished tips
  • Full 304 stainless steel mandrel-bent construction
  • 3-in to 2.25-in exhaust split helps maintain proper exhaust velocity
  • TIG-welded to perfection
  • Mishimoto Lifetime Warranty

Installation Difficulty: Easy

Key Features
  • Direct fit for the 2015-2021 Subaru WRX/STI
  • 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)
  • Extremely aggressive turbo and exhaust tone under acceleration and boost
  • Mates with the Mishimoto, stock, or most aftermarket downpipes
  • Installs in under an hour
  • Designed with oval mufflers to prevent highway drone
  • Quad 3.5-in staggered double wall, polished tips
  • Full 304 stainless steel mandrel-bent construction
  • 3-in to 2.25-in exhaust split helps maintain proper exhaust velocity
  • TIG-welded to perfection
  • Mishimoto Lifetime Warranty

Product Description

Mishimoto is proud to release the Performance Cat-back for the 2015-2021 Subaru WRX/STI. The biggest complaint is the stock cat-back exhaust systems lack of aggressiveness. By installing the Mishimoto Performance Stainless Steel Cat-back, the exhaust system is able to breathe easier, providing horsepower, torque, and a rich exhaust tone. After comparing many different muffler sizes and designs, the Engineers at Mishimoto chose oval mufflers which prevent highway drone, but still provide an aggressive exhaust tone. During dyno pulls with the 2015-2021 Subaru WRX/STI w/ CVT, Mishimoto'saw gains of up to 9 whp and 8 wtq using 93 octane fuel while maintaining safe AFRs on a stock tune (see additional images for dyno chart). This exhaust installs in under one hour and features quad 3.5in staggered double wall polished tips. The Mishimoto Performance Cat-back Exhaust provides an extremely aggressive turbo and exhaust tone under acceleration and boost, giving you that aggressive tone you have been looking for! 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 3.0in 2-bolt exhaust flange all the way through the 2.25in y-section. To top it off, this cat-back includes two 2.25in V-Band clamps, a 3in exhaust band clamp, a new 3in 2-bolt flange gasket, and all stainless steel hardware, so you don't have to worry about your hardware rusting ever again! For 2015 WRX owners looking to get the most out of their WRX, this cat-back exhaust mates perfectly with the Mishimoto Performance Downpipe. The Mishimoto Cat-Back Exhaust is proudly made in the USA and comes with the Mishimoto Lifetime Warranty you know and trust.
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TECH SPECS

More Information
Pipe Diameter3
Weight (Pounds)42
Engine CodesFA20DIT
EJ257
Chassis CodesVA
GH
Applications2015-2021 Subaru WRX
2015-2021 Subaru STI
NoteThis product has been designed to fit both manual and CVT transmission vehicles.

Mishimoto does not recommend installing this cat-back exhaust and the Mishimoto Performance Air Intake with the stock ECU programming. It is recommended that the customer is able to retune the vehicle's ECU after installing the cat-back exhaust and the intake. Power gains will vary depending on the type of ECU tune that is applied to the vehicle.

Downloads

Downloads
Engineering Report
pdf
(Size: 3.7 MB)
Engineering Report
Installation Guides
pdf
(Size: 1.3 MB)
Installation Guides

Purchase Includes

(1) 12 oz Cleaning Bottle with Spray Lid
(1) 8 oz Filter Oil
(1) Applicator Bottle with Orange Applicator Lid
Mishimoto Lifetime Warranty

Note:

This product has been designed to fit both manual and CVT transmission vehicles.

Mishimoto does not recommend installing this cat-back exhaust and the Mishimoto Performance Air Intake with the stock ECU programming. It is recommended that the customer is able to retune the vehicle's ECU after installing the cat-back exhaust and the intake. Power gains will vary depending on the type of ECU tune that is applied to the vehicle.

ENGINEERING

Warranty

Mishimoto Automotive (“Mishimoto”) warrants its products under this lifetime limited warranty policy (“Warranty Policy”). This Warranty Policy applies solely to: (i) Mishimoto Products purchased directly from Mishimoto or Mishimoto authorized dealers (each a “Mishimoto Product” and collectively, the “Mishimoto Products”) and (ii) the original purchaser of such Mishimoto Product (“Purchaser”). This Warranty Policy is non-transferable and all claims under this Warranty Policy must be accompanied by the original sales receipt. The terms and conditions of this Warranty Policy are subject to change by Mishimoto at any time without notice.

For our complete warranty policy, please click here.

Frequently Asked Questions (3)

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