GMC Sierra 3500 HD Intercooler Kit - Mishimoto - Duramax 6.6L - Black - 2011-2015. This Mishimoto intercooler kit is built for LML Duramax trucks and provides a complete upgrade to the charge-air system to reduce intake temperatures and improve airflow under load.

The kit includes a large bar-and-plate intercooler with cast-aluminum end tanks, mandrel-bent aluminum piping, and reinforced silicone boots. Designed to address high EGTs and heat soak common on modified Duramax rigs, the Mishimoto intercooler increases core volume and thickness compared to factory, helping deliver cooler, denser air to the engine and improving boost tolerance at higher power levels. Components are engineered for durability and on-road duty.

Features

• Bar-and-plate intercooler with cast-aluminum end tanks
• 101% increase in core volume and 73% thicker core vs factory
• 3.5" cold-side and 3.0" hot-side mandrel-bent aluminum piping
• Mishimoto DuraCore silicone boots and constant-tension T-bolt clamps
• Available in Stealth Black finish and covered by Mishimoto Lifetime Warranty

This kit fits 2011–2015 GMC Sierra 3500 HD trucks with the 6.6L Duramax (LML) and includes all piping and boots needed for installation. It’s a practical upgrade for owners tuning or towing who want lower intake temps and more reliable boost control without replacing core drivetrain components.

If you have questions or want help confirming fitment, call us directly at 512-982-9393 (TX) or 562-981-6800 (CA). We have two locations in Austin, Texas and the Los Angeles, California area where we offer installation and customization services. If you are thinking about purchasing multiple items, contact us for shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov