Got it! Wasn’t a bolt/nut, but a chunk of the cat. Hooked up a shop vac, shook the muffler and pop! No more rattle! Can’t post from my phone, photos are too large.


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Like you, I drive an X5. Also like you, I'm a detective trying to figure out what's wrong now, how long will it take make to fix it and how much will it cost this time