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This is a long shot, but could the part No.2 Aero cover panel (in the parts diagram) be a problem on some Tourings, be contributing the noise and vibration.
I know what I'd be doing, if I was trouble shooting this issue, I'd remove them and see if there is a difference. Could be acting as an amplifier, if there is a connection due to poor alignment, distortion, or some other problem with them.
BTW, the illustration is for the G20, G21 is not yet showing on RealOEM.
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