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Wehrli’s Stage 2 High Flow Bundle for 2020–2025 L5P Duramax combines a 4" fabricated intake, air box and upgraded intercooler pipes to increase airflow to the turbo and engine. The package replaces weak factory components with heavy‑duty 14‑ga aluminum 4" intake piping and 3" driver / 3.5" passenger intercooler pipes featuring CNC‑machined flanges with double O‑rings to reduce boost leaks. Bolt‑on, made in the USA, retains factory sensors, requires no tuning, and can install with basic hand tools; Wehrli reports 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 - Bronze Chrome
