Wehrli Custom Fabrication WCF100775-CAT High Flow Cast Turbo Intake Horn Candy Teal

The Wehrli Custom Fabrication WCF100775-CAT is a high flow cast aluminum turbo intake horn finished in Candy Teal powder coat. Engineered as a direct bolt-on replacement for the restrictive OEM plastic turbo inlet, this precision-crafted upgrade delivers a 27% improvement in airflow over stock and a 25% greater flow area than OEM at the compressor inlet — translating to improved throttle response, quicker turbo spool-up, and increased horsepower potential from your 6.6L Duramax diesel.

Constructed from CNC machined cast aluminum, the WCF100775-CAT features a smooth, optimized internal transition to a strategically designed anti-surge face that properly engages the turbo compressor cover for maximized airflow efficiency. The all-aluminum construction also delivers a more aggressive turbo and engine sound compared to the stock plastic piece.

Key Features:

• Flows 27% better than stock — 25% greater flow area at compressor inlet
• True 4" inlet with smooth transition to anti-surge compressor face
• CNC machined cast aluminum construction for strength and durability
• Compatible with factory VGT turbo and OEM-style aftermarket drop-in turbochargers with larger compressor wheels
• Includes #10 ORB threaded billet aluminum hose barb for PCV system connection
• O-ring seal at face of turbocharger for a leak-free fit
• Works with OEM and aftermarket cold air intake systems
• Bolt-on upgrade — no tuning required, no additional modifications necessary
• Emissions compliant
• Candy Teal custom powder coat finish
• Includes mounting hardware
• 1-Year manufacturer warranty
• Made in USA

The WCFab intake horn is a proven, emissions-compliant performance upgrade that installs using the factory mounting points with no supporting modifications needed — making it one of the most straightforward airflow improvements available for the L5P Duramax platform.