There is obvious road noise from the tires and also that you are really really low to the ground compared to something like a Subaru or something. Heck, even my old dropped WRX was a lil higher than the Z.
I think it does have a bit to do w/ the tired since to be honest, I rarely hear the other vehicles on the road next to me.
Also, once the radio is on, I really don't pay attention to it. I get in other cars and find it too quiet for my tastes personally. And the Z is ALOT quieter on the inside than say a 94 M3...Man those things are loud on the inside!
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