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Impressive work. Not to the reach of most (if not all) of us here.
When you say it almost completely gone, do you mean the noise on board in general? Of course some road noise will always be there, depending on road surface and tires.
But I suspect that part is similar to all variants. If so, why it affects only (or more) M Sport ones? And why it affects more Touring models than sedan?
Is this part difficult to access and remove/install? Can this be a problem for BMW resolve the issue?
How could this issue be brought to the attention of BMW AG?
Thanks,
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