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      12-08-2018, 08:20 AM   #3
RMNB
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Drives: 2021 440xi CPE BSM
Join Date: Jul 2013
Location: Maryland

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Have your tech check it out to assure proper installation. Doesn't sound like it's loose but as the muffler heats up it may have shifted. I've experienced this on a couple of muffler installs and it was a fitment issue. A little bending and pulling worked especially when it rained. Rattled like crazy when it got soaking wet. Different situation but might point you in the right direction.
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