Wehrli Custom Fabrication WCF100412 High Flow Turbo Intake Horn 4.8" LBZ LMM Duramax

The Wehrli Custom Fabrication WCF100412 is a high flow cast aluminum intake horn designed for 2006-2010 LBZ/LMM Duramax engines that replaces the restrictive OEM plastic inlet to provide increased airflow to your turbo for improved performance and throttle response. This intake horn delivers a 20% improvement in airflow compared to stock and features a 4.8-inch inlet, making it the largest intake horn on the market for this application.

Key Features:

• Cast aluminum construction with 4.8" inlet
• 20% improvement in airflow versus stock
• Retains connection port for PCV
• Eliminates factory resonator for improved appearance and more aggressive turbo sound
• Available in custom powder coat colors
• CNC machined cast aluminum construction
• Designed to complement WCFab Stage 1 LBZ & LMM intake kits

Manufactured by Wehrli Custom Fabrication, this high-flow turbo intake horn is engineered to eliminate airflow restrictions commonly found in the OEM LBZ and LMM intake tract, helping increase turbo efficiency, improve throttle response, and support higher horsepower builds while maintaining reliable daily driving performance.

Compatibility Note: Not compatible with OEM and aftermarket intakes that do not use a silicone boot connection at the horn. If your intake has a built-in rubber connection that slides onto the OEM horn and is molded to the air intake pipe, it will not fit with this horn. The WCFab horn must be used with an intake pipe that will accept a 4" boot and clamp.