Find a wide array of Silicone Couplers & Boots to finish your custom intake on your 2008-2010 Ford 6.4L Powerstroke. From 2" all the way up to 6" in diameter, you'll find the coupler to fit your needs. For increased strength, these silicone or rubber boots are reinforced to deliver a long service life. You'll find straight, reducing, hump, and angled boots ranging from 45 to 90-degree bend to choose from. XDP has all the best brands such as PPE, Vibrant, Mishimoto, and Full Send.