Replace the lightweight, leak prone, 1 5/8" OEM up pipes on your 2017-2024 Newer Duramax 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.

• Passenger Side Up Pipe
• Driver Side Up Pipe
• Up Pipe Gaskets (4)
• Flows 26% Better than OEM
• Made in USA