Wehrli Custom Fabrication WCF100412-BRZ High-Flow Turbo Intake Horn Bronze Chrome

The Wehrli Custom Fabrication WCF100412 High-Flow Turbo Intake Horn is a precision-engineered cast aluminum upgrade designed to replace the restrictive OEM plastic turbo inlet on 2006–2010 GM 6.6L LBZ and LMM Duramax diesel trucks. Finished in a striking Bronze Chrome custom powder coat, this turbo intake horn delivers a significant improvement in airflow and throttle response over the factory component.

Built from CNC machined cast aluminum, the WCF100412 features a 4.8-inch inlet — the largest intake horn available for this application — providing a reported 20% improvement in airflow over the stock inlet. The elimination of the factory resonator results in improved underhood appearance and 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 plastic inlet
• CNC machined cast aluminum construction for strength and precision
• Includes PCV (positive crankcase ventilation) port
• Eliminates factory resonator connection for cleaner install and enhanced turbo sound
• O-ring seal for secure turbo connection
• Includes silicone reducer boot and stainless steel T-bolt clamps
• Bronze Chrome custom powder coat finish
• Made in the USA

What's Included:

• 3-1/2" / 4.8" High-Flow Cast Aluminum Intake Horn
• 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 or aftermarket intakes (such as K&N) where the boot connection is molded directly onto the intake pipe and is not removable. If your intake uses a separate boot secured with two clamps, this horn will fit.

Supersedes WCFab part number WCF100341. Replaces GM OEM part number 98011738. Only fits applications using a WCFab 3" Y-bridge kit or WCFab Basic Intercooler Pipe for factory Y-bridge.