Our 2013 P85's only road noise is the sound of the Continental tires on their 21" wheels. (Well, there's some wind noise, particularly above 70.) We ordered studless snow tires from TireRack on 19" Rial wheels. We got them last week and I put them on this weekend. They are so quiet. At 55 mph on new asphalt, the car has barely any interior noise at all, and even on older asphalt, I'd say the snow tires are half the sound of the Contis. We got Dunlop Wintersport 3Ds. I've had these tires on previous cars and have never had any problems with traction. The tires are at 45 psi. I'm doing a 300+ mile round trip on Monday over the Cascades with a potential for snow. I'll be interested to see how they perform!