pmckechnie - It was my personal feeling that the mirrors are the culprit. When I first bought the 126 always thought there was a door not shut tight, window not up all the way, etc. I take medicine now that helps me deal with this paranoia - Seriously it appears only to be real bothersom when traveling against the wind at highway speeds.
I did put an Alpine in and keeping the volume at "19" seems to make the noise less noticible. (LOL)
BENZ THERE DONE THAT
15 VW Passat TDI
86 Holden Jackaroo Turbo D