Wehrli Custom Fabrication WCF100535-CAT Duramax Turbo Intake Horn - 4 LB7

The Wehrli Custom Fabrication WCF100535-CAT is a high-performance 4" turbo intake horn engineered specifically for 2001-2004 GM 6.6L Duramax LB7 engines. This precision-machined component replaces the restrictive factory turbocharger mouthpiece to deliver significantly improved airflow and engine performance.

Performance Benefits:

• Flows 40% better than stock intake horn
• True 4" inlet diameter for maximum airflow capacity
• Smooth flowing transition to turbo compressor cover optimizes airflow and drivability
• Improved throttle response and turbo spool characteristics
• Enhanced boost response under acceleration

Construction & Quality:

• Precision CNC machined cast aluminum construction
• Available in multiple powder coat finish options including WCFab Red, WCFab Grey, Gloss Black, and Gloss White
• Durable all-aluminum design for long service life
• Made in the USA with precision manufacturing standards

Compatibility & Installation:

• Direct replacement for 2001-2004 LB7 Duramax applications
• Works with stock and OE-style aftermarket drop-in turbochargers with larger compressor wheels
• Compatible with performance aftermarket intake systems utilizing a 4" boot connection with bead roll
• Works seamlessly with WCFab 4" intake kits for complete air induction system upgrade

This intake horn is an essential upgrade for LB7 Duramax owners seeking to eliminate airflow restrictions and unlock their engine's full potential. The precision machining ensures perfect fitment while the cast aluminum construction provides the strength and durability required for high-performance diesel applications.

Note: Not compatible with OEM intake systems. This product cannot ship to the State of California.