Wehrli WCF100418-GW L5P Duramax Stage 3 High Flow Intake Bundle, Gloss White

Vehicle Fitment

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

Fitment Notes

• Not CARB legal; not for sale or use in California

Features

• Combines the Stage 2 High Flow Bundle with an additional intercooler pipe upgrade into a single comprehensive package - the ultimate kit for emissions-compliant performance
• Increases airflow for both turbo and engine, improving efficiency, throttle response, and turbo spool-up
• Eliminates factory weak points that contribute to lost power, boost leaks, and complete failures in hard-working or high-performance use
• Replaces the OEM clip ring Y-bridge connection with a high-quality silicone boot and stainless steel T-bolt clamps for improved sealing and higher boost-holding capability
• 3" hot side and 3.5" cold side intercooler pipes feature CNC machined flanges with double O-ring seals to eliminate boost leaks
• Air box includes a dry filter assembly with Outerwear's pre-filter cover
• Finished in gloss white powder coat

Specifications

• Intake pipe diameter: 4"
• Hot side intercooler pipe: 3"
• Cold side intercooler pipe: 3.5"
• Finish: Gloss white powder coat

Included Components

• 4" aluminum intake pipe
• Intake horn with PCV port and surge ring
• Air box enclosure with dry filter and Outerwear's pre-filter cover
• 3" hot side intercooler pipe
• 3.5" cold side intercooler pipe
• Silicone boots, O-rings, and stainless steel T-bolt clamps
• Installation hardware

Product Description

The Stage 3 bundle takes the airflow gains of the Stage 2 kit further by adding upgraded hot and cold side intercooler piping to the package, tackling both the intake and charge-air side of the L5P's factory weak points in one comprehensive upgrade. The OEM clip-ring Y-bridge connection - a common source of boost leaks - is replaced with a proper silicone boot and stainless T-bolt clamp setup that holds boost more reliably.

Finished in gloss white, the fabricated aluminum intake pipe, horn, air box, and intercooler pipes work together to meaningfully improve turbo efficiency, throttle response, and spool-up. It's Wehrli's most complete intake and charge-air solution for the L5P, built for owners who want maximum airflow gains without stepping outside emissions-compliant territory.