My mustang seems to enjoy surging to 2 grand when idling and will not "reset" to normal idling RPMs. I believe it may have had something to do with my passenger side headers breaking off of the rest of the exhaust just above the connection to the pipes. It was obvious shotty homemade exhaust work when i took the exhaust off to keep it from dragging on the ground. the pipes didnt match at all and now im getting into a bind keeping from getting pulled over from how loud the mustang is. im going to replace the entire exhaust system but i do not know how to get the pipes back to normal order since the person who worked on the pipes had each side going straight back to its own catalytic converter and muffler. the pipes did not in any way shpe or form get close to each other. please help.