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      07-18-2019, 03:51 AM   #2
sirleeofroy
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Drives: E90 330D M-Sport LCI
Join Date: Aug 2017
Location: Buckinghamshire

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Hi and welcome!

This is just a guess but my first thought would be to check the plastic under trays etc, should one of those be loose and hanging slightly then it could cause humming as wind passes through..
Appreciate 0