Catback Exhaust - 2015-2021 WRX, 2015-2018 STi - 4" Muffler - 3" Double Wall Tips

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  • Catback Exhaust - 2015-2021 WRX, 2015-2018 STi - 4" Muffler - 3" Double Wall Tips
  • Catback Exhaust - 2015-2021 WRX, 2015-2018 STi - 4" Muffler - 3" Double Wall Tips
  • Catback Exhaust - 2015-2021 WRX, 2015-2018 STi - 4" Muffler - 3" Double Wall Tips
  • Catback Exhaust - 2015-2021 WRX, 2015-2018 STi - 4" Muffler - 3" Double Wall Tips
Frequently bought together:


The 2015-2021 WRX & 2015-2018 STi Catback from Nameless Performance follows a long line of exhaust R&D established by Nameless Performance. This configuration features 4 Inch Muffled and 3 Inch Double Wall Tips.  A full bolt-up solution for your Subaru, our catback is painstakingly engineered to fit perfectly and last the life of your vehicle.  Handbuilt in our Washington facility, our systems are able to be configured to your sound and look preferences to achieve a tailored solution for your car.  

Following closely in the footsteps of the '11-'14 WRX/STi Sedan Catback, with a number of improvements and changes to fit perfectly on your '15 WRX with the DIT engine or your '15 STi using the tried and true standard EJ series engine. In testing on the EJ series engine, this catback has shown midrange gains of +32ft lb of torque and +22hp at the wheels above and beyond a standard off-the-shelf Stage 1 tune. That standard is achieved through a number of innovative design cues that have made Nameless Performance the top name in Subaru aftermarket exhaust development and engineering.

The main feature of our exhaust is how much torque it builds.  Using a 3" main cirucit and matched flowing Y section and secondary dual circuits, our system builds more torque than systems that go oversized on the rear tubing diameter.

Our system produces more torque through the midrange than most exhausts on the market, while retaining higher than average horsepower gains. The result is a catback exhaust that makes a substantial difference in the behavior of the vehicle.

The second major advantage to our flow-matched dual rear circuits is a substantial decrease in low frequency cabin noise at cruise, often referred to as 'exhaust drone.' Oversized rear circuits produce boomy sounds at cruise, ours does not.

The system is designed using 100% T304 (low corrosion, high strength) stainless steel throughout. From the flanges to the tubing and hangers to the perforated tubing in the mufflers, all of the stainless we use is the highest grade T304. Mufflers are packed with ceramic wool, ensuring long muffler life and a compact lightweight design that muffles better than most mufflers that are 3-4x their size.

All weld joints are hand TIG welded by skilled craftsmen in our shop in the Pacific Northwest. With over 40 years of experience in the welding industry, our team is comprised of fabricators who have worked in every industry from automotive to heavy industrial fabrication. They pride themselves on their work and produce results that are unparalleled in the industry.

Each of the connections in the catback are attached with latch over v-band clamp assemblies where they are not connected at factory connection points. At the front, a conical flare and a proprietary 3" donut gasket connect the catback directly to a factory downpipe or an aftermarket downpipe with a connection that allows easy adjustment during installation.

All hardware required for installation is included with the system.

Installation Instructions:

Installation Guide - Axleback/Catback/Midpipe


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Warranty Information

Limited Lifetime Warranty available to original purchaser. Covers defects in workmanship and material.
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Additional Information

Muffler Type:
4" Muffler
Tip Style:
3" Double Wall
Product Type:
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