GMC Sierra 3500 HD Intercooler Boot Kit - Mishimoto - Hot-Side Boot Kit with DuraCore technology - `11-`14 is a direct-fit silicone hot-side boot kit designed for the 6.6L LML Duramax. It replaces factory boots with a durable, high-resistance solution built for high-powered use.

This Mishimoto kit features DuraCore technology — a synthetic inner layer used in Mishimoto silicone diesel boots that improves resistance to heat, pressure, fuel, and oil. The five-layer silicone construction helps prevent leaks and blowouts while maintaining factory fitment for straightforward installation. The kit includes Mishimoto constant-tension T-bolt clamps for reliable, consistent holding power, and is backed by Mishimoto’s lifetime warranty for added peace of mind.

Features

• Direct-fit hot-side boot kit for 2011–2014 6.6L LML Duramax (GMC Sierra 3500 HD compatibility)
• DuraCore inner layer for superior resistance to heat, pressure, fuel, and oil
• Five-layer 100% silicone construction to reduce risk of blowouts and leaks
• Includes constant-tension T-bolt clamps for consistent clamp force
• Maintains factory fitment; Mishimoto lifetime warranty (MMBK-DMAX-11HBK)

If you have questions or want help confirming fitment, call us directly — we’re happy to assist. We offer installation and customization services at our two locations in Austin, Texas and the Los Angeles, California area. Call: 512-982-9393 (TX) or 562-981-6800 (CA). If you’re considering multiple items, contact us for possible shipping discounts. We install on premises at both locations.

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