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WCFab's billet exhaust manifold kit for 2017–2025 L5P Duramax replaces restrictive cast manifolds with TIG-welded, high-flow billet steel components matched to exhaust ports and internally divided for optimal flow. The kit includes new gaskets, ARP 12-point fasteners, sensor ports and EGR riser flange, and is finished in a high-temperature black ceramic coat. Outlet locations accept OEM-style up pipes for straightforward integration.
Wehrli 17-24 L5P Duramax Billet Exhaust Manifold Kit w/ Gaskets and ARP Hardware
