Your car is going to explonde

odd, I can talk just fine when I was doing 120 with my stock tires

FI longtube headers! ;)

Is there a "New 370Z Owner -most common issues" on the main page somewhere?

Sweet, sweet hum, exhaust note, engine roar...Yeah, baby, that's MY Z!!!

I agree that z34 is pretty noise car. I actually felt the loud noiseness while on the high way, and on the road where had hell lot of small sands. lol

i remember my cousin kept complained that she feels like she on the airplane :p

OP- it's also possible you have defective wheel bearing(s). They get progressively louder from about 50mph and have a eerie sound... Kinda like a DC10 if you know jets.