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Replace the lightweight, leak prone, 1 5/8" OEM up pipes on your 2017-2023 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.
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Reviewed by: JOE05/28/2020 03:57AM
Product ownership: Less than 1 month
Not purchased from: Wehrli Custom Fabrication - WCFabComments:
I installed these along with wc fab emissions intact down pipe. These seem to wake up the turbo along with the down pipe. I am not tuned yet just a derringer. Most of my dead peddle seems to be gone now. I am very happy with the upgrade even with the amount of hours I put in changing them out in my driveway. Cant wait to see what happens when I get ecm and tcm tuning.