Cold Air Intake for GMC Sierra & Chevy Silverado 2500HD 3500HD (2017-2019) 6.6L Engine

The L5P Duramax is a torque monster, but from the factory, it sounds like a vacuum cleaner. It’s time to ditch the restrictive plastic baffles and let your turbo actually breathe.

Performance Cold Air Intake Kit with Heat Shield for Chevrolet Silverado & GMC Sierra 2500HD/3500HD (L5P Duramax)

If you are driving a 2017-2019 GM Heavy Duty truck, you are running the L5P 6.6L Duramax—arguably one of the most capable platforms GM has ever built. However, to meet strict NVH (Noise, Vibration, and Harshness) standards, the factory intake system is designed to be quiet, not efficient. It chokes down the air volume to muffle the induction noise, which ultimately limits throttle response and keeps EGTs higher than they need to be during heavy towing or hard acceleration.

This intake upgrade solves that problem by replacing the corrugated factory tubing and enclosed box with a high-flow, mandrel-bent T-306 aluminum pipe and an open-element filter system. By smoothing out the airflow path, you reduce the vacuum the turbo has to fight against. The result? A claimed 8-10% increase in horsepower and a sharper throttle response that gets that heavy truck moving faster off the line. Plus, you finally get to hear the turbo spool up—a sound the stock airbox completely hides.

The kit includes a durable steel heat shield powder-coated to resist corrosion and keep engine bay heat away from the intake charge. This ensures your engine is pulling in cooler, denser air rather than hot stagnant air from around the exhaust manifold. Finished in a "Black Wrinkle" coating, the piping matches the OEM engine bay aesthetic for a clean, professional look that doesn't scream "cheap aftermarket part."

Why You Need This Upgrade

• Proven Power Gains: Engineered to deliver an estimated 8-10% increase in horsepower and 6-8% boost in torque by maximizing air volume.
• L5P Specific Design: Tailored specifically for the 2017-2019 6.6L Duramax architecture to ensure proper mass air flow sensor readings.
• Thermal Management: Includes a powder-coated steel heat shield to block engine heat and lower Intake Air Temperatures (IATs).
• Durable Construction: The T-306 aluminum piping is scratch-resistant and lightweight, replacing heavy and brittle factory plastics.
• Washable High-Flow Filter: Reusable design means you stop buying paper filters; simply wash and re-oil for consistent performance.

Installation Notes

This system is designed as a direct replacement for the OEM assembly. No additional fabrication or parts are needed. The install can be completed with standard screwdrivers and socket wrenches. Mechanic's Note: When installing on the L5P platform, always ensure your MAF (Mass Air Flow) sensor is cleaned and seated in the correct orientation on the new pipe to prevent check engine lights. Disconnect the negative battery terminal for 15 minutes during install to force the ECU to relearn the new airflow parameters.

Replaces These OEM Applications

• 2017-2019 Chevrolet Silverado 2500 HD 6.6L
• 2017-2019 Chevrolet Silverado 3500 HD 6.6L
• 2017-2019 GMC Sierra 2500 HD 6.6L
• 2017-2019 GMC Sierra 3500 HD 6.6L

Upgrade your truck today and feel the difference that proper airflow makes on the highway and the dyno.