![]() The main functional elements of this catback exhaust are its matched flow dynamic from the 3" diameter resonated main circuit into the 2" diameter secondary circuits (the dual circuits of the rear of the exhaust). 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. 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. 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. ![]() The 2015-2021 WRX & 2015-2018 STi Catback from Nameless Performance follows a long line of exhaust R&D established by Nameless Performance over the last four years.
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