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Wehrli’s 4" High Flow cast aluminum intake horn for 2001–2004 Chevrolet and GMC 6.6L Duramax LB7 trucks replaces the restrictive OEM turbo inlet to increase airflow and improve throttle response. The true 4" inlet and smooth transition to the turbo compressor cover flow substantially more air than stock, offering quicker spool and measurable gains when paired with supporting modifications. It features a precision CNC‑machined cast aluminum construction, O‑ring seal at the turbo face, includes mounting hardware, and is powder coated.
Wehrli 01-04 Duramax LB7 4in High Flow Intake Horn - Gloss Black
