Wehrli Custom Fabrication WCF100412-DG High Flow Turbo Intake Horn - Dark Green

The Wehrli Custom Fabrication WCF100412 High Flow Turbo Intake Horn is a precision-engineered upgrade that replaces the restrictive OEM plastic inlet on 6.6L LBZ/LMM Duramax diesel engines. Featuring a massive 4.8-inch inlet — the largest intake horn on the market — this cast aluminum horn delivers a 20% improvement in airflow over stock, resulting in improved turbo response, throttle feel, and overall engine efficiency.

Constructed from CNC machined cast aluminum, this intake horn is built for long-lasting durability and precision fitment. It ships finished in a custom Dark Green powder coat, applied in-house by Wehrli Custom Powder Coating for exceptional quality control and consistency. The horn eliminates the factory resonator connection for a cleaner underhood appearance and a more aggressive turbo sound.

Key Features:

• 4.8" inlet — largest intake horn available for the LBZ/LMM platform
• 20% airflow improvement over factory intake horn
• CNC machined cast aluminum construction for precision and durability
• Integrated PCV port included
• Eliminates factory resonator connection for improved sound and aesthetics
• Includes silicone reducer boot and stainless steel T-bolt clamps
• O-ring seal for a secure, leak-free connection
• Custom Dark Green powder coat finish — applied in-house
• 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: Not compatible with OEM or aftermarket intakes (such as K&N) that use a built-in molded rubber connection at the horn. This horn requires an intake pipe that accepts a 4" boot and clamp connection. Supersedes part number WCF100341. Replaces GM part number 98011738.