Wehrli 100702 4 inch Cold Air Intake Kit with Air Box | 2020-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax L5P

Features:

• Increases airflow for more horsepower and torque
• Improves throttle response and intake sound
• Draws cooler air from Ram Air duct
• 4in high-flow aluminum intake piping
• Smooth bends improve air velocity
• Replaces restrictive factory intake components
• Includes dry filter and pre-filter cover
• Custom powder coat finish options available
• Installs easily with basic hand tools
• No tuning required, bolt-on ready
• Fits stock trucks with no modifications
• Made proudly in the USA

High-Performance Intake Upgrade for GM 6.6L Duramax

If you’re looking to wake up your L5P Duramax and give it the airflow it really deserves, the Wehrli 4in Cold Air Intake Kit with Air Box is a serious upgrade over the factory setup. This isn’t just a cosmetic change—this intake is built to move air more efficiently, cool things down under the hood, and deliver the kind of throttle response and power you can actually feel when you step into it. From the factory, the intake system on the 2020–2025 Silverado and Sierra 2500HD/3500HD is loaded with plastic components and tight restrictions that choke airflow. Wehrli’s system replaces all that with a full 4-inch intake pipe and custom-fabricated aluminum air box. The tubing is smooth and oversized by design, with clean aerodynamic bends that help maintain air velocity as it travels into the turbo. This means more oxygen-rich air reaches your engine, which translates to improved horsepower, torque, and quicker turbo spool.

Heavy-Duty Air Box with Simple Bolt-On Setup

The air box itself is made from durable 10-gauge aluminum and built to seal tightly around the included dry filter. It draws in cold air from both the hood’s Ram Air duct and the inner fender, helping lower intake temps and keep your engine running more efficiently—especially under load or in warmer climates. That cooler air not only supports better combustion but also enhances reliability when you’re towing, hauling, or pushing your truck harder than usual. Wehrli also includes a high-quality dry air filter and an Outerwears pre-filter cover for added protection against dust and debris. The whole kit is finished in your choice of signature WCFab powder coat colors, so you get a custom look that holds up to heat and engine bay grime. Best of all, install is straightforward and doesn’t require tuning or custom modifications. It’s a true bolt-on setup that fits perfectly on stock trucks using basic hand tools. Everything you need comes in the box, including silicone boots, stainless steel T-bolt clamps, and a seal for the hood duct connection.

Fits: 2020, 2021, 2022, 2023, 2024, 2025 GM 2500/3500HD 6.6L Duramax

Application Note: FAILURE TO DISABLE AIR FILTER MONITOR SYSTEM WILL RESULT IN A SERVICE AIR FILTER MESSAGE AND REQUIRE DEALERSHIP TO RESET THE SYSTEM. THE AIR FILTER LIFE WILL SHOW DISABLED MESSAGE WHEN SETTINGS ARE CORRECT.

Replaces the following GM Part Numbers: 84841229, 84841225, 84262962, 85614333, 84554702