just bought my brand-spankin' new '07 STi.
So of course I take it for a few rides and find that at about 110 mph I get a sudden onset of a loud noise. It definitely doesn't go away at higher speeds (louder at 120 mph, couldn't test 130 and above). It is a loud, full-bodied whistling sound similar to a ship's horn or when you blow into an empty bottle at an angle. The noise is independent of the gear I'm in, so I say it's the wind. May come from the hood scoop.