Sounds like wheel bearings...a common prob on aging contours ...Is there any kind of pulsing when you apply the brakes? I had a strange clicking sound on my ZX2 brakes that was caused by loose caliper mounts...do you have ESP (Extended Service Plan)???

Here is a post from someone with similar problems...

http://www.contour.org/ubbthreads/showflat.php?Cat=&Board=trouble&Number=98004&page=1&view=collapsed&sb=5&o=7&fpart=1#Post98133

Regards, Art

2004 Velocity Red RX-8 *Racing Beat Intake and Exhaust *Grand Touring Package *Red/Black Leather *Fender Strakes *Rotary Accents *Xenon HID's *Bose