I don't find my MYP to be that loud... Stock 21s or even with studded, winter tires on it. It did however, catch me off guard with the noise the snow made when it hits the underside of the vehicle. (really, slush) I drove the vehicle from my delivery area to a tire shop for the winter tires so I had a way to compare on the same road. Of course I didn't do a db rating... One thing I did notice - just how much the air ride suspension in our JGC smooths out the bumpy roads. That's even with 18s with a lot of sidewall on them.