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Yep. At about 120 it's a high pitched hum - lower than a whistle. A bit like blowing over the top of an empty milk bottle (on MY01 and later). I have heard people state before it is the mirrors but if that is the case, why don't MY01/02 WRX's do it also?
If you drive through it, it goes away quite quickly though
STi7's do it too. Scared me sh*tless the first time. Now I just treat it as a cruise control, when it starts humming it's time to back off. On the track / private road of course.
Front windows near the mirrors may be?
At high speeds as the air passes in front of the mirror enters the window on the front area thus the whistling, if you add a expansion in the elastic crankle (there is already one about two inches) it reduces the noise remarkably.
JIM