Description
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
- Fully TIG Welded 11 GA Stainless Steel Construction
- Heavy Duty 2″ Passenger Side Up Pipe
- Heavy Duty 2″ Driver Side Up Pipe
- Flows 26% Better than OEM
- Up Pipe Gaskets (4)
- NO TUNING REQUIRED
- Made in USA




















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