Mine gets very noisy at top speed because of exhaust.
But i did just recently get the bearing in the driver's side rear wheel fixed and replaced..mechanics charged me $140, don't know if that's any good or not, (being that i'm a female and i just wanted it fixed) because of hearing a "rolling" noise at low speeds. When i got the car back, the noise was still there, and we discovered it was coming from the other rear tyre. So we jacked it up ourselves, had a play round with the wheels, took them off, put them back on, tightened them up etc and it seemed to go away. Haven't had too many problems since.
Don't know if that helps or not, good luck :lolcry:
Cheers
~*CaRz!*~