Wehrli Custom Fabrication WCF100417-FTB High Flow Turbo Intake Horn - Factory Turquoise Blue

The Wehrli Custom Fabrication WCF100417 High Flow Turbo Intake Horn is a precision-engineered, CNC-machined cast aluminum upgrade designed to replace the restrictive OEM plastic inlet on the 2011–2016 GM 6.6L LML Duramax diesel engine. With a class-leading 4.8-inch inlet — the largest intake horn available for this application — this bolt-on upgrade delivers a measured 5.6% improvement in airflow over stock, resulting in improved throttle response, stronger turbo spool, and a more aggressive engine note. Finished in a custom Factory Turquoise Blue powder coat, this horn adds a striking, show-quality appearance to the engine bay.

This intake horn eliminates the factory resonator, simplifying the intake path and reducing flow restrictions. A built-in PCV port retains proper crankcase ventilation, and the precision O-ring turbo connection ensures a leak-free seal. The kit includes stainless steel T-bolt clamps, a silicone reducer boot, and new EGR gaskets for a complete, ready-to-install assembly. It is designed to complement WCFab's Stage 1 LML Intake Kits and Stage 1 High Flow Bundle Kits.

Key Features:

• 4.8-inch inlet — largest intake horn on the market for LML Duramax applications
• 5.6% airflow improvement over the factory plastic inlet
• CNC machined cast aluminum construction for strength and durability
• Integrated PCV port for factory crankcase ventilation routing
• Eliminates the OEM resonator for a cleaner engine bay and more aggressive turbo sound
• O-ring turbo seal connection for a secure, leak-free fit
• Includes stainless steel T-bolt clamps and silicone reducer boot
• Includes new EGR gaskets
• Custom Factory Turquoise Blue powder coat finish
• Replaces OEM part numbers 12642296 and 12637801
• Proudly Made in the USA

Compatibility Notes: This horn requires an intake pipe that connects via a 4-inch silicone boot and two clamps. It is not compatible with OEM or aftermarket intake pipes (such as K&N) that use a molded rubber connection that slides directly onto the factory horn. It is also not compatible with aftermarket LML Y-bridges that relocate the manifold inlet from the factory driver-side position. 2011 model year trucks must update the PCV Regulating Valve to 2012–2016 specification for correct fitment.