Corvette Exhaust System - B&B PRT with 4.5" Quad Oval : 2006-2013 C6 Z06 & ZR1The Billy Boat Performance Exhaust PRT C6 exhaust system is the latest in resonance control technology from B&B. Completely redesigned and re engineered for the C6, 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, though a mellow sound is emitted at