Great for use as an air intake, I/C tubing or throttle body inlets. Cast aluminum high flow inlet elbow tube with 3" OD beaded lip ends for proper hose clamping. Used successfully on 500HP turbo applications. Unit is casted with boss for misc. nipple fitting tap. Designed to flow like a 3" pipe but has an ovalized area to dodge tight spots in the engine bay. Flow volume is uniform throughout the ID.