[BNaylor]

Bearing noise is deceptive. It could be the opposing hub/bearing. I had a similar situation but the sound was a distinct humming noise that varied with speed. After installing the new hub (right side) the noise was still there so I installed the one I removed on the left side and the noise disappeared. I don't put much mileage on the GTP or use it for street so it was no big deal re-using my old hub.

The CV joints normally do not make a humming/buzzing sound. More like a clunk or metallic ticking sound. But they can cause vibration. I recall GM had installed some flaky axle half shafts on some 2000 - 2001 model Grand Prixs so might be worth looking into to.

The part that drives the axle half shafts is the differential located on the passenger side of the transaxle. Also, there are output bearings/bushings on each side of where the half shafts go into the tranny which could generate noise.