You'll find the vast selection of Silicone Couplers & Boots you need to fabricate a custom intercooler tubing set up on your 2017-2019 Chevy/GMC 6.6L L5P Duramax. You can find couplers ranging in size from 2" all the way up to 6" diameter. 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 reinforced couplers are manufactured with durable rubber or silicone for increased reliability. With high-quality brands like PPE, Vibrant, Mishimoto, and Full Send, you'll find what you need at XDP.