Wehrli Custom Fabrication WCF100417-BC LML Duramax High Flow Turbo Intake Horn Blue Candy

The Wehrli Custom Fabrication WCF100417-BC is a high-flow cast aluminum turbo intake horn designed as a direct replacement for the restrictive OEM plastic inlet on 2011–2016 LML Duramax diesel trucks. Finished in WCFab's Blue Candy custom powder coat, this CNC machined cast aluminum horn delivers measurably improved airflow to the turbocharger for better engine performance and throttle response.

With a 4.8-inch inlet — the largest intake horn available for this application — this horn flows 5.6% more air than the factory unit and pairs perfectly with WCFab Stage 1 LML Intake Kits and Stage 1 High Flow Bundle Kits. It eliminates the factory resonator connection for improved underhood appearance and a more aggressive turbo and engine sound.

Key Features:

• 4.8 in. inlet — largest intake horn on the market for LML Duramax
• 5.6% improvement in airflow over stock
• CNC machined cast aluminum construction
• Includes PCV port with #10 ORB threaded billet aluminum hose barb
• Eliminates factory resonator connection
• Includes silicone reducer boot and stainless steel T-bolt clamps
• Includes O-ring seal and new EGR gaskets
• Compatible with OEM and drop-in VGT style aftermarket turbochargers
• Blue Candy custom powder coat finish
• No tuning required — bolt-on installation
• Emissions compliant
• Made in USA

Replaces GM OEM Part Numbers: 12642296 and 12637801

Important Notes: Not compatible with OEM or aftermarket intakes that use a built-in rubber connection molded to the intake pipe. The WCFab intake horn requires an intake pipe that accepts a 4-inch boot and clamp. Not compatible with aftermarket LML Y-bridges that relocate the manifold/bridge inlet from the original factory driver-side location. 2011 model year trucks must update the PCV Regulating Valve to 2012–2016 model year spec for correct fitment.