Kooks 21603100 3" x 3" Off-Road X-Pipe (Non-CARB Compliant) 2005-2008 Chevrolet Corvette C6 LS2/LS3 6.0L/6.2L This item is not for sale in California/Non CARB compliant Inlet - 3 Inches. Outlet - 2.5 Inches