Just got my car back after driving a SC loaner for a week. Loaner had 21" wheels, my car has the factory 19" and Primacy tires. Both have coils. I noticed a big difference in interior sound on semi-bumpy roads, when going 40-50 MPH. Much louder with my car. Sort of a low frequency "buffeting" sound, like you get in any car with only a back window open. Anyone else experience this?