I have a whistling noise on my 31L but it varies depending on the wind direction. Sometimes it is very pronounced and other times it is gone completely. Sometimes on the drivers side and other times on the passenger side. I believe in my case that is the aerodynamics of the mirrors or the cab? I don't hear it when the windows are rolled up. Had the unit in for some minor warranty work recently but forgot to mention this. I doubt if there is much they could do about it anyway but wouldn't hurt to ask. Any other 31L owners notice this?
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