ROad noise is loud with stock tires, I got the DUnlops and it was real quiet. WInd noise at 80-100 is somewhat loud because of the big sideview mirrors, but overall the car is very comfy and rides smooth and quiet.
As far as the exhaust goes, it is a very quiet car, actually going down the 1/4 mile you can barely hear our cars while you can hear every other car. Mark back me up on that. I love the sound the exhaust makes sort of a weaker Porsche Boxster sound, I"m just trying to figure out a way to duplicate the sound of a carrera of Bozster now.
At Vtech it sounds great, it screams instead of making a loud rumble like other cars do in high RPMS. and it is really sweet if you have an AEM and put it up there in cold weather.
As for the Toyos, don't listen to grandpa over here, get rid of those stock tires and get Dunlop Sport 5000s. You'll love em, trust me.