Hyperflow Exhaust Catless Down PipeNEW DESIGN! The TurboXS Down Pipe with a catless race pipe uses a massive cast 304 Stainless Steel Bellmouth that tapers to 3. 0 inch piping where it connects to the mid pipe. Unlike previous designs, the new TurboXS downpipe will bolt to any stock or 3 inch aftermarket catback exhaust system. Features: Two piece design: Reduced shipping costs Change to catted without having to buy a whole new downpipe (Cated Pipe WS02 CP sold separately) Easier