BD Diesel BD Duramax Up Pipes Kit Chevy/GMC 2001-2004 LB7 1043800

Replaces the factory exhaust up-pipes (exhaust manifold to the turbo) which are prone to leakage due to the deterioration. BD up-pipes are designed to minimize restriction to the turbo utilizing internally shielded expansion bellows. The BD up-pipes are a durable, longer-life replacement for this common problem and are perfect as an upgrade while performing other engine or transmission repairs. 304 stainless steel precision cast mounting flanges eliminate exhaust tubing blowouts and ensures correct fitment304L 2-inch stainless tubing prevents loss of heat energy and will not corrode like aluminized steel or 409 stainlessLarger bore (1.8" ID) internally shielded 304 stainless bellows, eliminates restrictive 1.3" ID OEM bellows maximizing exhaust energy to drive turbochargerSmooth mandrel bends improve exhaust gas flow - tubing ID is not compromisedIncreased turbo response with lower EGT'sUser must have aftermarket downpipe, does not fit with OE Downpipe