These types of threads freak me out so bad that I just put my car on ramps to check the two 18mm bolts that hold the diff to the subframe - no issue. Takes 5 mins to check - just an FYI.
In each reported case of a failure like this here on m3post, the person has had an aftermarket rear section exhaust. I can't believe that a shop would forget to put the nut back on the bolt, or not tighten the hell out of it. People routinely remove these bolts to drop the hangers on the exhaust vs. pulling the exhaust out of the bushing.
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