Designed for WRX & STI owners that want a high-flowing system with less noise and a subdued look, the Turbo XS standard muffler turboback offers performance and flow with less noise. The Turbo XS Standard Turboback features Turbo XS’s 4″ bellmouth downpipe which tapers to 3″ into a 3″ high-flow cat or 3″ catless race pipe, then runs into a 3″ midpipe and terminates in a 3″ diameter oval muffler with a rolled tip. This is an excellent system for WRX & STI owners looking for a complete after-turbo exhaust solution, but don’t want the noise of the RFL system and want to ditch the stock muffler as well.