Wehrli Custom Fabrication WCF100535-IP High Flow Turbo Intake Horn Illusion Purple - 4

The Wehrli Custom Fabrication WCF100535 4" High Flow Cast Aluminum Turbo Intake Horn is a direct-fit, bolt-on upgrade engineered to replace the restrictive OEM turbocharger mouthpiece on the 6.6L Duramax LB7. Designed and manufactured in the USA, this high-flow turbo inlet delivers a 40% improvement in airflow over stock, translating to measurable gains in horsepower, torque, and throttle response. This listing is for the horn finished in WCFab's signature Illusion Purple custom powder coat.

Key Features:

• Flows 40% better than stock — significantly reduces intake restriction for improved turbo performance
• True 4" inlet with a smooth, flowing transition to the turbo compressor cover for optimized airflow and drivability
• Precision CNC machined cast aluminum construction — durable, lightweight, and corrosion-resistant
• Compatible with stock and OEM-style aftermarket drop-in turbochargers with larger compressor wheels
• Works with performance aftermarket intake systems utilizing a 4" boot connection with bead roll (such as WCFab 4" Intake Kits)
• Finished in Illusion Purple custom powder coat for a show-quality underhood appearance
• Bolt-on installation — no tuning required; fits stock trucks with no additional modifications needed
• Made in the USA

Compatibility Note: This intake horn is not compatible with OEM intake fitment. It requires an aftermarket intake pipe that accepts a 4" boot and clamp connection. Intakes with a rubber/silicone connection molded directly into the intake pipe will not be compatible with this horn.

Pair this intake horn with WCFab's 4" Cold Air Intake Kits or Stage 1 High Flow Bundle Kits for maximum performance gains. Supersedes WCF100342.