Porsche 997 C2, C4, C2S, C4S This sports exhaust set conveys the sound of power, presence and natural sporting presence the 911 needs. Built with a large diameter chamber bypass pipe the engine note changes with more aggressive throttle. Please Note: For standard 997 3.6L models the factory tail pipe will not fit. Use 997 S tail pipes or after-market tail pipes. Made from 14 - 16 gauge T304SS, polished mirror finish, Designed to give an open throttle sound and more aggressive at medium and high speeds. We also have a wide selection of stainless steel tail pipes. Sound = deeper than the factory standard exhaust but not too loud