4" 409 Downpipe Back System w/5" Tip # S6004409

Fits 2001-2007 GM Classic Duramax. 409 stainless off-road system. Eliminates catalytic converter. 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 * Lifetime Warranty