Wehrli WCF100414-GB Stage2 High Flow Intake Bundle Kit for 20-25 GM 6.6L

Vehicle Fitment

• 2020-2025 GM 6.6L Duramax L5P (Chevrolet Silverado 2500HD/3500HD, GMC Sierra 2500HD/3500HD)

Features

• Stage 2 high-flow intake and intercooler bundle for maximum airflow
• 4" aluminum mandrel-bent intake piping with smooth bends
• Enclosed air box with removable lid for easy access
• High-flow dry air filter with protective pre-filter cover
• 3" driver (hot) side and 3.5" passenger (cold) side intercooler pipes
• CNC-machined flanges with double O-rings to reduce boost leaks
• Premium silicone boots and stainless steel T-bolt clamps
• Gloss black powder coat finish for corrosion resistance

Specifications

• Part Number: WCF100414-GB
• Intake Pipe Diameter: 4" (102 mm)
• Intercooler Pipe Diameter: 3" hot side / 3.5" cold side
• Material: 14 ga aluminum piping; 10 ga aluminum air box
• Filter Type: Dry element with pre-filter
• Finish: Gloss Black powder coat
• Clamps: Stainless steel T-bolt style
• Installation: Bolt-on, no tuning required

Included Components

• 1x 4" mandrel-bent intake pipe
• 1x Enclosed aluminum air box with removable lid
• 1x High-flow dry air filter
• 1x Pre-filter cover
• 1x 3" driver (hot) side intercooler pipe
• 1x 3.5" passenger (cold) side intercooler pipe
• Silicone boots, stainless steel T-bolt clamps, O-rings, and hardware

Product Description

The Wehrli WCF100414-GB Stage 2 High Flow Intake Bundle Kit is a comprehensive performance upgrade designed specifically for 2020-2025 GM 6.6L Duramax L5P diesel trucks. This Stage 2 kit combines a high-flow intake system with upgraded intercooler piping to significantly improve airflow from the air inlet through to the turbocharger and intercooler. With larger-diameter aluminum piping, smooth mandrel bends, and a robust air box with removable lid, this bundle enhances horsepower potential, throttle response, and intake sound while maintaining OEM-like fitment.

Finished in gloss black powder coat, the bundle includes high-flow dry filtration with protective pre-filter cover, premium silicone boots, CNC-machined flanges with double O-rings to help minimize boost leaks, and heavy-duty stainless steel T-bolt clamps for secure connections. The package is bolt-on and installs with basic tools, requiring no additional modifications or tuning. Ideal for Duramax builders seeking a balanced upgrade for daily driving and performance applications.

Designed as a complete Stage 2 upgrade, this kit replaces restrictive factory components and adds substantial airflow capability to support higher boost levels and more efficient engine breathing. Its all-in-one design ensures compatibility with stock engine hardware while offering a durable, track-ready alternative for demanding use.