Wehrli Custom Fabrication WCF100412-BS High Flow Turbo Intake Horn 4.8in LBZ LMM Duramax

The Wehrli Custom Fabrication WCF100412-BS High Flow Turbo Intake Horn is a precision-engineered cast aluminum turbo inlet designed to replace the restrictive OEM plastic intake horn on 2006–2010 GM 6.6L Duramax LBZ and LMM diesel engines. Engineered and manufactured in the USA by WCFab, this upgrade delivers measurably improved airflow to the turbocharger for better throttle response and overall engine efficiency.

Key Features:

• 4.8-inch inlet diameter — the largest intake horn available for the LBZ/LMM platform
• 20% improvement in airflow over the factory intake horn
• CNC machined cast aluminum construction for durability and precision fitment
• Includes a PCV port for crankcase ventilation connection
• Eliminates the factory resonator for improved underhood appearance and a more aggressive turbo sound
• Includes silicone reducer boot, stainless steel T-bolt clamps, and O-ring seal for a secure, leak-free connection
• Custom powder coat finish (BS color variant)
• Made in the USA by Wehrli Custom Fabrication

This intake horn supersedes model WCF100341 and replaces GM OEM part number 98011738. It is designed to complement WCFab Stage 1 LBZ and LMM Intake Kits. Note: Not compatible with OEM or aftermarket intakes (such as K&N) that do not use a silicone boot connection at the horn — if your intake has a molded rubber connection that slides directly onto the OEM horn, this part will not fit.