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Wehrli Custom Fab billet exhaust manifolds and 2" stainless up pipes for 2017–2025 L5P Duramax replace restrictive factory cast manifolds with TIG-welded, CNC-machined billet steel units. Port-matched and internally divided, they keep OEM-style up pipe outlets, include a sensor port and EGR riser flange, and ship with gaskets, ARP 12PT fasteners and a black ceramic coat rated to 2000°F for durability.
Wehrli 17-24 Chevrolet Duramax Billet Exhaust Manifold & Stainless Up Pipe Kit w/ Gaskets & Hardware
