4" Aluminized Downpipe Back w/5" Tip # S6004AL

Fits 2001-2007 GM 2500 and 3500 Classic Duramax. 4" Downpipe back aluminized single exit with 5" polished tip. Off-road kit, eliminates catalytic converter if equipped. KEY FEATURES: * Mirror polished T304 stainless steel tip * Delivers a rich, mellow exhaust note * Installs with common hand tools * Can improve fuel economy by 1-2 mpg * Boosts torque and horsepower * Complete Down Pipe Back System