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why not get a db reading from inside the cabin, seems most are concerned with the drone/loudness from inside the car...
would make it an easy benchmarch test in term of position, say center arm rest..wot v dd thru the rpms and gears..would probably need a friend to read the levels as you drive, but could be useful
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2019 AW G30 530e l ZPP l ZMP l ZDH
Retired: 2016 F80 M3, 2012 E90 M3, 2008 535i
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