Wehrli Custom Fabrication WCF100535-GM 4-Inch High Flow Turbo Intake Horn for GM Duramax LB7

The Wehrli Custom Fabrication WCF100535-GM is a 4-inch high-flow cast aluminum turbo intake horn designed for 2001-2004 GM Silverado/Sierra 2500HD and 3500HD trucks equipped with the 6.6L Duramax LB7 diesel engine. This intake horn replaces the restrictive OEM turbocharger mouthpiece to provide increased airflow to your turbocharger for improved engine performance and throttle response.

Key Features:

• True 4-inch inlet with smooth flowing transition to turbo compressor cover for optimized airflow and drivability
• Precision CNC machined cast aluminum construction
• Compatible with stock and OE-style aftermarket drop-in turbochargers with larger compressor wheels
• Provides quicker turbo spool-up and increased horsepower
• Available in multiple custom powder coat finishes
• Made in USA

Max-effort tuned trucks can see 10-15 HP gains, while applications with upgraded turbochargers can experience as much as 20 HP improvements. This intake horn works with performance aftermarket intake systems utilizing a 4-inch boot connection with bead roll, like the WCFab 4-inch intake kits. Installation requires modification or removal of the OEM wire harness track that runs in front of the OEM intake horn for proper clearance; wire loom is provided to help complete this process.