Replace the lightweight, leak prone, 1 5/8" OEM up pipes with these heavy duty 11 gauge 2" Stainless up pipe kit. HD Stainless Bellows that will not crack and leak like OEM. Increase Turbo spool-up and decrease EGT's. This kit is for use with twin turbo applications and factory exhaust manifolds or WCFab Duramax Billet Exhaust Manifolds (WCF100363), they WILL NOT clear a conventional down pipe routed behind the engine. Both sides are built nearly symmetrical with no indents for a conventional down pipe to clear.
NOTE: These up pipes WILL NOT CLEAR a standard down pipe routing behind the engine.