MBRP 2003-2007 Chev/GMC 1500 HD Classic 6.0L CC-SB Cat Back Dual Split SideOur high flow performance exhaust systems maximize exhaust flow so your engine keeps its cool with lower exhaust temperatures. Your reward will be greater fuel efficiency; more torque; more horsepower; and last but not least a sound that is pure MBRP. This Part Fits: Year Make Model Submodel 2004 2005 Chevrolet Silverado 1500 LS 2004,2006 Chevrolet Silverado 1500 LT 2005 Chevrolet Silverado 1500 HD Base 2003,2005 Chevrolet Silverado 1500 HD LS