hmmmm ....... i got the same headers and i just did them about a month ago......i dont see y it would be vibrating.... all i know is for me it was a vacume hose the size of a tooth pick and it made my car run real crappy to the point were i didnt drive it or start it up for 2 weeks....idk im sure someone else will give u some better answer so just wait till tonight when everyones on lol