Complete the cold air intake system on your 1999-2003 Ford 7.3L Powerstroke with Intake Couplers & Elbows. These couplers come in various sizes ranging from 3.5" all the way up to 6" diameter and are manufactured out of rubber, silicone, or plastic. Available in straight, reducing, 90-degree, and hump couplings. AFE, Fleece Performance, Vibrant, and Grand Rock are just some of the high-quality companies available at XDP.