Description MBRP – 4″ Stainless DP Back Off-Road Exhaust for 2001-2007 GM 6.6L Duramax Fits All LB7-LLY-LBZ 6.6L Engine Models Part# S6004409 2001-2007 Chevy/GMC 2500/3500 Classic Duramax Down Pipe Back, Extended Cab/Crew Cab, Off-Road, Single Side KEY FEATURES: Mirror polished T304 stainless steel tip Rich, mellow exhaust note Installs with common hand tools Can improve fuel economy by 1-2 mpg Boosts torque and horsepower Complete Cat Back System
