Mishimoto 2015 Subaru WRX 3in Stainless Steel Cat-Back ExhaustMishimoto is proud to release the Performance Cat back for the 2015+ 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