Wehrli Custom Fabrication WCF100418-IBB Stage High Flow Intake Bundle Kit Duramax - 3 for L5P

The Wehrli Custom Fabrication Stage 3 High Flow Intake Bundle Kit is a comprehensive performance upgrade designed to maximize airflow on both the intake and exhaust sides of 2020-2026 L5P Duramax engines. This complete kit combines the Stage 2 High Flow Bundle with a 3.5-inch downpipe into a single package, providing increased air and exhaust flow for improved efficiency, throttle response, and turbo spool-up while eliminating weak points in the factory design that can contribute to lost power, boost leaks, and component failures.

Air Intake System Components:

• 4-inch aluminum intake pipe with 14-gauge construction and smooth aerodynamic bends
• 3.5-inch intake horn with PCV port and surge ring (over 1 inch larger than OEM diameter)
• Air box enclosure constructed of 10-gauge aluminum sheet with dry filter assembly
• Outerwears hydrophobic pre-filter cover for enhanced filtration and protection
• Draws cold air through hood ram air duct and inner fender for cooler intake temperatures
• Removable air box lid for easy filter inspection and maintenance

Intercooler Piping Components:

• 3-inch hot side (driver side) intercooler pipe replaces restrictive 2.5-inch factory pipe
• 3.5-inch cold side (passenger side) intercooler pipe replaces leak-prone factory plastic pipe
• CNC machined flange with black anodized billet aluminum adapter and double O-ring seal
• OEM clip ring design replaced with high-quality silicone boots and stainless steel t-bolt clamps
• Designed to withstand higher boost pressures and eliminate boost leaks

Exhaust Downpipe Component:

• 3.5-inch downpipe replaces restrictive crushed factory part for improved exhaust flow
• Black ceramic coated and heat wrapped for improved thermal efficiency
• Connects to DOC (Diesel Oxidation Catalyst) outlet flange
• Mates with OEM exhaust system front pipe using 4-bolt style flange connection
• Includes bungs for all OEM sensors

Installation and Hardware:

• Complete installation hardware, silicone hump boots, and stainless steel t-bolt clamps included
• Retains all factory connection points and sensors
• Installs with basic hand tools
• Compatible with stock trucks - no tuning required
• Pairs best with emissions-compliant tuning and drop-in turbochargers for maximum performance gains

Made in the USA at Wehrli Custom Fabrication's DeKalb, Illinois facility using state-of-the-art CNC machining and fabrication equipment. Full assembly is finished in WCFab's signature custom powder coat for durability and a unique appearance. Significantly increases airflow to the turbo, producing improved horsepower and torque while providing a more aggressive engine and turbo sound during acceleration.