I have had hints from other message boards that this is a problem with all. As you might have noted in my comment above, they are aware of the problem on previous Vin numbers and have "fixed" the problem on newer Vin #'s. I will provide more info after the Porsche Service Manager gets back to me on the 5th. By the way, I put on new snow tires recommended by Porsche and still the noise exists. The dealer and my tire dealer "ground force" balanced the tires and still the noise and vibration exists.