the stud is tack welded to the exhaust headers. I'm sure that the weld has broken and the stud is spinning. It may be possible to get a grip on it from the back side and take the nut off.
the stud is tack welded to the exhaust headers. I'm sure that the weld has broken and the stud is spinning. It may be possible to get a grip on it from the back side and take the nut off.