Wehrli Custom Fabrication WCF100535-FB High Flow Turbo Intake Horn Duramax - 4 LB7

The Wehrli Custom Fabrication WCF100535 4" High Flow Turbo Intake Horn is designed to replace the restrictive factory turbocharger mouthpiece on 2001-2004 GM 6.6L Duramax LB7 engines. This high-performance intake horn delivers a 40% improvement in airflow over the stock intake horn, providing increased airflow to your turbocharger for improved engine performance and throttle response.

Key Features:

• True 4" inlet diameter with smooth flowing transition to turbo compressor cover for optimized airflow and drivability
• Precision CNC machined cast aluminum construction for durability and heat resistance
• 40% better airflow compared to factory intake horn
• Compatible with stock IHI turbochargers and upgraded drop-in IHI turbos
• Works with performance aftermarket intake systems utilizing 4" boot connection with bead roll
• Custom powder coated finish (-FB color designation)
• Made in USA

This intake horn provides quicker turbo spool-up and can deliver 10-15 HP gains on max-effort tuned trucks, with applications featuring upgraded turbochargers potentially experiencing up to 20 HP improvements. Pairs perfectly with WCFab 4" cold air intake kits for maximum performance gains. Note: Not compatible with OEM intake systems; requires aftermarket intake with removable 4" silicone boot connection.