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The Wehrli WCFab 4" high-flow cast intake horn for 2001–2004 Chevrolet Silverado and GMC 2500/3500 HD trucks with the LB7 6.6L Duramax replaces the restrictive OEM turbo inlet to improve airflow and spool. It flows about 40% better than stock, is compatible with stock or drop-in IHI turbos, and requires a 4" boot connection with bead roll. Includes mounting hardware and custom powder coat.
Wehrli 01-04 Duramax LB7 4in High Flow Intake Horn - Cat Yellow
