Nuts keep coming loose and falling off of my Header studs. Anyone else have this problem? When I put my x-pipe on originally I found one nut was missing from the stud on the passenger side and the gasket was broken. I replaced the gasget and the nut, but today I noticed I had a really bad exhaust leak, got under the car and found that 2 nuts were missing and one other very loose. Can the studs be replaced?