The skirting is the plastic shielding under the front of the car. Sometimes it gets caught on things and will vibrate.
Now you mention the speeds of 35-40 and then 65-80. The latter you state is the loudest but what happens in between? No noise?
Do a tire rotation putting front right on right rear and left front on left rear. While you have the tires off look at the shielding for the wheels to ensure that it is not pushed in a touching the rotor rotation. Rotate the wheels while in the air and feel for any detectable drag, noise, etc.
Wednesday, January 31st, 2007 AT 2:07 PM