If you have only the rear windows down and the noise is a low rumble, then that's normal - it's just the resonance of the air rushing through.

Now drive with all 4 windows down at about 30 mph and listen to the portion of the seatbelt over your shoulder flutter. Heh.

[This message has been edited by kirby34 (edited October 24, 2000).]
_________________________
-Jeff
"May the Force be with you...for me to poop on."
"Russell! Somebody gonna get a hurt real badddd."