Exhaust Question

A buddy of mine has a 2003 1500 and he is looking into putting on a Daytona style exhaust. He has the bolt on kit in the mail, and he has asked me to put it on for him. I just one small question, does anyone know what size the bolts are on the Y-Pipe? I only have 12pt sockets right now and I don't want to put those on a breaker bar and go at it on his truck and strip off the bolts, so i was going to get a nice 6pt just for this. So if anyone could tell me the size of those bolts before I get started, it would be much appreciated.