1Fast, Or whoever did piping and cat when u did ur header. My header is coming in on Monday. My bf and his buddy are gonna put it on at the house plus we already have the cat. Did you have to drive your car to the muffler shop open header to get the piping done? Or will it hook back up to the stock piping so you can at least drive it over there? And then the muffler shop did your piping and cat? ??? Thanks.