The Billy Boat Performance C6 Corvette PRT exhaust system is the latest in both performance and resonance control technology. Completely redesigned and reengineered for the 2005-2013 Corvette, the system is simple in design though more complex in theory. You can now have a mellow sound at cruising speeds AND a sport note when you're tearing up the streets! It allows true straight through exhaust passage under aggressive driving conditions, and yet a mellow sound is emitted at cruising speeds thanks to the unique sound Purge Chamber. Designed especially for the automatic paddle-shift, and cars with headers, this Billy Boat Performance PRT Exhaust system works purely on physics and adrenaline. An excellent choice for all 6-speed applications as well. Increases of 15hp and 14 ft.lbs over stock exhaust system. Fits 2009-2013 LS3 equipped Corvettes. Available with quad 4” round or 4.5” oval double wall tips