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Wehrli’s Stage 1 High Flow Bundle for 2017–2019 L5P Duramax improves airflow between the turbo and engine by replacing weak factory intercooler plumbing with heavy‑duty 3" driver and 3.5" passenger pipes. The kit removes the OEM resonator and vulnerable boot joints, adds reinforced silicone boots, stainless t‑bolt clamps and a CNC‑machined flange with double O‑rings to prevent boost leaks. Finished in custom powder coat colors, it installs with basic hand tools and fits stock trucks without tuning.
Wehrli 17-19 Duramax L5P Stage 1 High Flow Bundle Kit - Candy Red
