Kooks Custom Headers - 10-11 Camaro SS Complete 3" Stand Alone Cat-Back Exhaust. Includes 3" Polised Oval S/S Mufflers and Polished 4" Slash Cut S/S Tips. Works with stock Manifolds or the Kooks OEM Header System. Tube 3" Inlet 2 1/2" OEM Outlet 3" Unit System