Wehrli 4in Intake Kit Stage 2

Fits 2020–2025 Chevrolet Silverado and GMC Sierra 2500/3500 HD with 6.6L LP5 Duramax

Part #: WCF100684-RED

Overview

The Wehrli 4-inch Intake Kit Stage 2 is a high-flow intake system designed specifically for the 2020 to 2025 Chevrolet Silverado and GMC Sierra 2500/3500 HD trucks equipped with the 6.6L LP5 Duramax engine. This kit replaces the factory’s restrictive plastic intake components with a fabricated aluminum intake pipe and air box enclosure paired with a dry filter assembly. It is engineered to enhance engine performance by improving airflow to the turbocharger, resulting in quicker throttle response, increased horsepower and torque potential, and cooler intake temperatures.

Ideal for Duramax owners seeking to optimize their truck’s breathing capabilities, this intake kit supports more aggressive engine sound and improved turbo efficiency while maintaining a durable and visually striking appearance with its custom powder coat finish.

Key Features

This intake kit offers several technical advantages designed to support performance and durability:

• Constructed from high-quality fabricated aluminum for strength and heat resistance
• Large diameter 4-inch piping with smooth aerodynamic bends to maximize airflow velocity and volume
• Intake horn over an inch larger than OEM diameter to reduce turbo inlet restrictions
• Dry filter assembly for efficient filtration and easy maintenance
• Designed to draw cold air through the hood Ram Air duct and inner fender for cooler intake temperatures
• Finished in custom powder coat colors for a unique, durable look
• Direct replacement for multiple GM part numbers, ensuring proper fit and function

Construction & Design

The entire assembly is crafted from lightweight, durable aluminum, providing superior heat dissipation compared to factory plastic parts. The smooth bends and large diameter piping are engineered to reduce airflow turbulence and restriction, supporting improved turbocharger efficiency. The intake horn’s increased diameter further minimizes bottlenecks right before the turbo inlet, enhancing overall engine breathing.

Installation & Fitment

This intake kit is designed as a direct replacement for the factory intake system on 2020–2025 Chevrolet Silverado and GMC Sierra 2500/3500 HD trucks with the 6.6L LP5 Duramax engine. Installation is straightforward, utilizing existing mounting points and hardware for a secure fit without modification.