I put one on for a friend, no problems. The exhaust seemed to go in one end and out the other, without stopping or leaking out.. so all seems good...lol No idle problems that I have noticed when we were out driving, been about 6 months... It does use a pipe clamp at the "H", I would be sure you had the header bolts tight, and the pipes where you want them before you tighten that down, I suspect once you crimp it there with the clamp, would not be easy to adjust.