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Wehrli Custom Fab Stage 3 high‑flow bundle kit for 2017–2019 Duramax L5P combines Stage 2 intake upgrades with a 3.5" ceramic‑coated downpipe to improve both intake and exhaust flow. The package replaces weak factory plumbing with larger‑diameter aluminum pipes and a coated downpipe that connects to the DOC outlet while retaining factory sensor bungs. Installs with basic hand tools and fits stock trucks without tuning.
Wehrli 17-19 Chevrolet L5P Duramax High Flow Intake Bundle Kit - Gloss Black
