The TurboXS Two-Piece Downpipe or 'Stealthback' Exhaust for the 2011-2014 STI sedan is a bell mouth downpipe and race-pipe (or cat-pipe) that will bolt directly to your stock exhaust or any 3" aftermarket catback exhaust. This is perfect choice for anyone who wants to sneak past the spouse or just an unsuspecting street competitor. The TurboXS stealthback exhaust coupled with ECU tuning will easily yield performance gains up to 50-60 ft. lbs and 30-40 WHP. Compatible with any aftermarket catback exhaust system, the Stealthback from TurboXS allows you to customize the sound of your car to your liking. The TurboXS 'Stealthback' is available both with and without a high-flow catalytic converter.