2020-2026 Duramax Stage 2 High Flow Intake Kit (WCF100414)

Fits

The WCFab Stage 2 High Flow Bundle is the ultimate air-management overhaul for your 2020-2026 L5P Duramax. This comprehensive kit combines a full 4-inch cold air intake system with heavy-duty hot and cold side intercooler pipes, eliminating every restrictive plastic component and leak-prone rubber boot between your air filter and the engine. By upgrading to smooth, mandrel-bent 14-gauge aluminum, you’ll see immediate improvements in turbo spool-up, throttle response, and overall engine efficiency.

On the intake side, the oversized 4-inch horn and airbox enclosure draw cool air directly from the factory hood ram-air duct and inner fender. After the turbo, the kit replaces the narrow 2.5-inch factory piping with a massive 3-inch driver-side (hot) pipe and a 3.5-inch passenger-side (cold) pipe. Featuring CNC-machined flanges and double O-ring seals, this bundle is engineered to hold higher boost pressures than factory components, making it a "must-have" for both stock trucks and high-performance applications.

Part Number: WCF100414

• Complete Airflow Solution: Combines Stage 1 and Stage 2 kits to optimize both the intake and charge-air cooling paths.
• Massive 4" Intake: Replaces restrictive factory plastic with 4" aluminum piping and an oversized intake horn for maximum velocity.
• Heavy-Duty Intercooler Pipes: Includes a 3" Hot Side and 3.5" Cold Side pipe to eliminate boost leaks and blown factory boots.
• Superior Sealing: CNC-machined flanges with double O-rings and stainless T-bolt clamps ensure a leak-free fit under high boost.
• Direct Bolt-On: No tuning required! Retains all factory sensors and connection points for a seamless install.
• Custom Look: Finished in a durable powder coat to dress up your engine bay while protecting against corrosion.
• Made in the USA: Fabricated from high-strength 14-gauge aluminum for ultimate durability.

• 4 in. Aluminum Intake Pipe
• 4 in. Intake Horn with PCV Port and Surge Ring
• Air box enclosure with dry filter assembly and Outerwears pre-filter cover
• Installation hardware, 4 in. silicone hump boot and stainless t-bolt clamps
• 3 in. Hot Side Intercooler Pipe
• 3.5 in. Cold Side Intercooler Pipe
• CNC-machined flange and black anodized billet aluminum adapter with Double O-Rings
• Silicone Boots, Stainless Steel T-Bolt Clamps, and O-Rings
• Intercooler Outlet Clip

• Installation: Installs with basic hand tools; no modifications to the truck are necessary.
• Savings: This bundle saves you over $60 compared to purchasing the intake and pipe kits individually.
• Emissions: This product cannot ship to the state of California.
• Color: Custom powder coat colors are available—please allow for additional lead time for coating.