Don't have the roof bars fitted.
The noise comes from the base of the wind screen and sounds like when you blow through tissue paper wrapped round a comb.
The wipers seem more "prone" than on my old MK V GTI.
I can't think what else would cause it. It's not engine revs as it would happen at other speeds.
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Current: G20 M340i
On Order: G20 M340i LCI
Retired: F22 M240i; F11 530d; E91 330d
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