i bought a 3" Flowmaster exhaust made specifically for a e body, and i went to install it today but the pipes won't hook up with the headers. i have hooker headers. everything else looks fine except when you go to connect the H-Pipe to the headers the pipes that go inbetween these don't fit (looks as though the headers are too far apart for the pipes).has anybody else had this problem if so what did you do?