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Wehrli’s Stage 2 High Flow Bundle for 2020–2025 L5P Duramax upgrades intake and intercooler plumbing with a 4" fabricated intake, air box and heavy‑duty 14‑ga aluminum intercooler pipes to improve flow and reduce weak factory joints. The kit uses CNC‑machined flanges with double O‑rings, reinforced silicone boots and stainless t‑bolt clamps to hold higher boost pressures. Bolt‑on and compatible with stock trucks, installs with basic hand tools, made in the USA; Wehrli recorded a 25 HP gain with a 4" inlet when used with a Max Effort Tune.
Wehrli 20-24 Duramax L5P Stage 2 High Flow Bundle Kit - WCFab Grey
