check the wear on the brake pads ! check the dust shield at the rear of the discs for stones or that they aren't bent
wheel bearings usually drone and will make a noise when loaded i.e. cornering
Have you looked under the car to see if anything is hanging down ? it sounds like something hitting the ground, bushes etc usually only make a noise when you hit a bump
also double check your wheel nuts are tight !
Tyres are standard for a 370z 245/40/19 front and 275/35/19 rears
Sure? That's the sizes costco Michelin gave me for a 370z... but then again it is costco
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