I am replacing the Michelin Primacy OEM tires (235-45/17) at 35,000 miles. There is 66% of the tread life remaining but the scalloping (both inner & outer) has created too much noise to live with. The alignment is good and they have been balanced & rotated every 7,500 miles. Is this normal for the $2,500 optional Sport Suspension like my Service Advisor claims or do I have a problem? Can someone tell me if there is a better tire for this model? I bought this car new and I love this car. Thanks, E39