Just got done installing the Pypes offroad x pipe to go along with my fr500s axlebacks I just got off Cam. Haven't fired it up, but about to. I did manage to break one of the studs in half (the one I was having problems with yesterday). The nut on there was a 17mm for some reason and the other one on the same flange was a 15mm. I remember missing the nuts when I removed my ARH longtubes a couple of years ago and had to go to ford to buy some replacement nuts (which I think were the 15mm ones). Luckily I didn't have problems with the other 3 and managed to do the swap. There was barely enough thread in the broken stud to put the nut on. I was able to get the nut all the way in and the stud barely reached the end of the new nut since the flange on the Pypes is thinner than the stock flange. Hopefully I don't have any problems there, but if I do, I'll worry about it later. I think I can get the broken stud off and insert a new one, but didn't want to deal with that right now. I forgot how loud my car was when I was running ARH longtubes with offroad x pipe along with Mac AB's. I'm guessing this will sound about the same, which is good since I loved the old setup.