Which flange are you talking about? The three bolt flange at the header is a chore. IFRC it uses 17mm bolts and were not easy to get to. I used an extra-long socket extender with a swivel joint at the socket and a cheater bar to break it loose. Definitely left some skin on the underside of the car. The other flanges using two 14mm bolt were fairly easy as long as you can get the bolts loose.