Fabricate a custom intercooler tubing set up on your 2011-2016 Chevy/GMC 6.6L LML Duramax with the vast selection of Silicone Couplers & Boots available. From 2 inch all the way up to 6 inch diameter, you"ll find the coupler to fit your needs. These couplers are constructed with durable rubber or silicone and are reinforced for greater strength. You can find the coupler you need, whether you need a reducing, hump, straight, or angled boot with a 45 to 90 degree bend. XDP has all the best brands such as PPE, Vibrant, Mishimoto, and Full Send.