I never had an issue with my iPhone 11 Pro in my car, but iOS 13 (any version) was causing horrible distortion and crackling in my wife's MB. I installed iOS 14 Beta and the noise is completely gone. Give that a go and hopefully that fixes your issue.
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2024 X3 M40i
2014 550i
2008 Z4 3.0si 6MT
2011 Z4 35si (sold)
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