Find a huge variety of Silicone Couplers & Boots you need to finish your project 2007.5-2010 Chevy/GMC 6.6L LMM Duramax. Whether you need a reducing, hump, straight, or an angled boot ranging from 45 to 90-degree bend, you'll find the coupler you need. These rubber or silicone boots offer greater longevity as they are reinforced for strength. Find the coupler or boot you need with a variety of sizes from 2" up to 6" in diameter. You'll find top brands such as Vibrant, PPE, Full Send, and Mishimoto brand products available at XDP.