Wehrli Custom Fabrication WCF100418-SC Stage 3 High Flow Intake Bundle Kit - Sparkle Copper

The Wehrli Custom Fabrication WCF100418-SC Stage 3 High Flow Intake Bundle Kit is a comprehensive intake and intercooler upgrade finished in a premium Sparkle Copper powder coat. This Stage 3 bundle combines Wehrli's Stage 2 High Flow Bundle with a 3.5 in. downpipe into a single package, delivering increased air and exhaust flow for improved efficiency, throttle response, and faster turbo spool-up.

Engineered to eliminate the weak points inherent in the factory design, this kit replaces the restrictive OEM plastic intake components with large-diameter, mandrel-bent aluminum piping. The high-flow fabricated intake pipe, intake horn, and aluminum airbox enclosure work together to significantly increase airflow to the turbocharger, resulting in improved horsepower, torque, and cooler intake air temperatures. Air is drawn through the hood Ram Air duct and inner fender for maximum cold-air advantage.

Kit Includes:

• 4 in. aluminum intake pipe — 14-gauge construction with smooth aerodynamic bends
• 3.5 in. intake horn with PCV port and surge ring — over 1 inch larger than OEM diameter
• Aluminum airbox enclosure with lid — constructed of 10-gauge aluminum sheet
• Dry air filter assembly with Outerwears pre-filter cover
• 3 in. hot side (driver) intercooler pipe with ceramic coat and heat wrap
• 3.5 in. cold side (passenger) intercooler pipe
• 3.5 in. DOC-back downpipe with heat wrap
• Hood ram air port seal
• 4 in. silicone hump boot and stainless T-bolt clamps
• CNC machined flanges with double O-rings
• Intercooler outlet clip and all installation hardware

Key Features:

• No tuning required — true bolt-on installation
• Retains all factory sensor connection points
• OEM clip ring at Y-bridge replaced by boot and clamp for improved sealing
• Eliminates known factory failure points and boost leak sources
• Premium Sparkle Copper powder coat finish
• Provides a more aggressive engine and turbo sound during acceleration

The WCF100418-SC is a complete Stage 3 solution that requires no additional modifications or upgrades, making it an ideal bolt-on performance upgrade for the L5P Duramax platform.