Looking To Add More Power And Torque? Upgrade Your Subaru Factory Cat-Back To Gain More Power, Torque And A More Aggressive Sound. GenX Performance Offer A Great Selection On Cat-Back Exhausts For Subaru STI, WRX And BRZ From AWE Tuning, Cobb, ETS, GrimmSpeed, Invidia, Perrin, Tomei And Much More In Stock And Ready To Ship. Wide Product Selection. Free Shipping & Handling. Great Customer Service. Get Your Subaru Performance Cat-Back Exhaust Now At GenX Performance.