Wehrli Custom Fabrication WCF100412-BG High Flow Turbo Intake Horn Bengal Grey

The Wehrli Custom Fabrication WCF100412-BG High Flow Turbo Intake Horn is a precision-engineered, cast aluminum upgrade designed to replace the restrictive OEM plastic inlet on 2006–2010 GM 6.6L Duramax LBZ and LMM diesel engines. Finished in WCFab's signature Bengal Grey powder coat, this intake horn delivers measurable airflow gains and a bold underhood appearance.

With a 4.8-inch inlet diameter — the largest intake horn available for this application — the WCF100412 delivers a 20% improvement in airflow over the stock inlet, feeding the turbocharger more efficiently for improved throttle response and overall engine performance. The resonator connection is eliminated, resulting in a more aggressive turbo and engine sound.

Key Features:

• 4.8" inlet diameter — largest intake horn on the market for LBZ/LMM applications
• 20% airflow improvement over the factory inlet
• CNC machined cast aluminum construction for durability and precision fit
• Includes PCV port for factory-style crankcase ventilation routing
• Eliminates the factory resonator connection for improved sound and airflow
• Custom Bengal Grey powder coat finish
• Includes silicone reducer boot, stainless steel T-bolt clamps, and O-ring seal
• Made in the USA

What's Included:

• Turbo inlet horn with PCV port
• Silicone reducer boot
• Stainless steel T-bolt clamps
• O-ring seal

Compatibility Note: This intake horn requires an intake pipe that uses a boot and two clamps for connection at the horn. It is not compatible with OEM-style or aftermarket intakes (such as K&N) that use a built-in rubber connection molded directly to the air intake pipe. The intake pipe must accept a 4" boot and clamp. Supersedes part number WCF100341. Replaces GM part number 98011738.