A guy on the M45 forums complained of the same noises, turns out the 4 bolts that hold in the hub bearing to the spindle actually were backing out and 2 were completely backed out. this was letting the hub wiggle where the spindle was stationary causing the scraping noise. Not sure what caused it but it's worth it to check yours.
Oh, btw - The 2006 Infiniti M45 shares the same hubs as the 370z
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