Wehrli Custom Fabrication WCF100412-IBB High Flow Turbo Intake Horn Illusion Bengal Blue

The Wehrli Custom Fabrication WCF100412 High Flow Turbo Intake Horn is a precision CNC-machined cast aluminum upgrade designed to replace the restrictive OEM plastic turbo inlet on 2006–2010 GM 6.6L Duramax LBZ and LMM diesel engines. With a massive 4.8-inch inlet — the largest intake horn on the market — this direct-fit replacement delivers a 20% improvement in airflow over stock for enhanced turbo efficiency, improved throttle response, and stronger overall performance. This listing is for the Illusion Bengal Blue (IBB) custom powder coat finish.

Key Features:

• 4.8" inlet — largest intake horn available for this application
• 20% airflow improvement over the factory plastic intake horn
• CNC-machined cast aluminum construction for superior strength and precision fit
• Includes PCV port to retain crankcase ventilation connection
• Eliminates resonator connection for improved sound and reduced restriction
• Finished in Illusion Bengal Blue custom powder coat
• Includes silicone reducer boot, stainless steel T-bolt clamps, and O-ring seal
• Made in the USA

What's Included:

• Turbo intake 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 accepts a 4" boot and clamp connection. It is not compatible with OEM-style or aftermarket intakes (such as K&N) that use a molded rubber connection that slides directly onto the factory horn without a separate boot and clamp.

OEM Cross-Reference: Replaces GM Part Number 98011738. Supersedes WCFab Part Number WCF100341.