Bought one of these and was so excited. I put the car on a lift to burn the gaskets, tightened everything back up, and after 2 days they were flowing. The flange where it connects to the middle tubes has studs, the studs don't have an adapter on the end to screw tight. When you install them there is a screw that doesn't fit in because the pipe is in the way, it has to be slotted to attach it. I finally got a pipe bar attached to my Mustang so I can work on it every time the manifolds leak without engine judder.