Replace the lightweight 16G, leak prone, 1 5/8" OEM up pipes on your 2017-2025 6.6L L5P Duramax equipped Chevrolet Silverado or GMC Sierra 2500 / 3500 HD truck 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 factory exhaust manifolds. - - Fully compatible with WCFab Billet Exhaust Manifolds (Part Number WCF100373). - - INCLUDES GASKETS! -NO Tuning required, bolt on! -Will fit on stock truck no other modifications or upgrades necessary! - - Replaces the following GM Part Numbers: 12688021, 12702943, 12681437, 12680270, 12681162, 12674813, 12681162, 12676611 - - Also fits 2019+ L5D Duramax (4500/5500/6500) Medium Duty Trucks.. Wehrli Custom Fab Up Pipe Kit w/ Gaskets, 2in, for 2017-2025 Duramax L5P, Stainless. Wehrli 17-24 Chevrolet 6.6L L5P Duramax 2in Stainless Up Pipe Kit w/Gaskets. Up Pipe Kit w/ Gaskets, 2in, for 2017-2025 Duramax L5P, Stainless. Fully TIG Welded 11 GA Stainless Steel Construction. Up Pipe Kit 17-25 Dmax L5P Stainless. Heavy Duty 2" Passenger Side Up Pipe. Heavy Duty 2" Driver Side Up Pipe. Flows 26% Better than OEM. Turbocharger Up Pipe Kit. Up Pipe Gaskets (4). NO TUNING REQUIRED. UpPipes 17-25 SS. Made in USA

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