Fabricate a custom intercooler tubing set up on your 2001-2004 Chevy/GMC 6.6L LB7 Duramax with the vast selection of Silicone Couplers & Boots available. These rubber or silicone boots offer greater longevity as they are reinforced for strength. Sizes from 2-inch to 6-inch in diameter are available to fit the application for the boot you need. You can find the coupler you need, whether you need a reducing, hump, straight, or angled boot with a 45 to 90 degree bend. PPE, Vibrant, Mishimoto, and Full Send are just a few of the top brands available from XDP.