GMC Sierra 3500 HD Intercooler Kit - Mishimoto - Duramax 6.6L LML - Silver - `11-`15. A complete intercooler solution designed for 2011-2015 GMC Sierra 3500 HD trucks with the Duramax 6.6L LML, offered in a durable silver finish.

This Mishimoto intercooler kit replaces the restrictive factory components with performance-focused parts engineered to lower intake temperatures and improve charge air flow. The package includes mandrel-bent aluminum intercooler piping, a larger bar-and-plate intercooler with cast aluminum end tanks, Mishimoto DuraCore silicone boots, and constant-tension T-bolt clamps. The intercooler core is substantially larger than stock—listed as a 101% increase in core volume and 73% thicker—helping reduce air-charge temps, support higher boost tolerance, and provide more consistent performance under load. All components are built for diesel service and long-term durability. This kit fits direct to the LML Duramax plumbing and is available in silver to match the factory look.

Features

• Direct-fit for 2011-2015 GMC Sierra 3500 HD - Duramax 6.6L LML
• 3.5-inch cold-side and 3.0-inch hot-side mandrel-bent polished aluminum pipes
• Mishimoto DuraCore silicone boots with constant-tension T-bolt clamps
• Bar-and-plate core with cast aluminum end tanks; 101% more core volume, 73% thicker than stock
• Silver finish and backed by Mishimoto Lifetime Warranty

If you have questions or want help confirming fitment, call us directly — 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