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Wehrli Custom Fab Stage 3 high‑flow bundle kit for 2017–2019 Duramax L5P shown in WCFab Red combines the Stage 2 intake upgrades with a 3.5" ceramic‑coated downpipe to boost intake and exhaust flow. The kit replaces restrictive factory parts with robust aluminum piping, includes upgraded intercooler plumbing and downpipe with sensor bungs, and installs bolt‑on with basic tools while retaining factory connections and sensors.
Wehrli 17-19 Chevrolet L5P Duramax High Flow Intake Bundle Kit - Red
