I assumed you were referring to an internal rattle, if in engine bay replicate for dealer tech and see what comes up.
I had a squeak in the rear somewhere and tech knew exactly what it was when I replicated it.
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2020 M2C
2018 M2 LCI
Gone 1M, 991.1, 991.2, 718S, 991.2 TT, R8 Spyder RWD
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