Originally Posted by twin_snails

+1 on going to 19" wheels. I would do 19x8.5 fronts with 245/40 and 19x10 rears with 275/35 Michelins. Handling is orders of magnitude better than the stock size. The car will feel much more planted. I had close to that setup with Michelin Pilot A/S Plus and the setup left nothing to be desired. It was in my opinon, how the car should have some from the factory. Also 370Z sport wheels take that same size tire so dimensions are a perfect +1 fitment over the stock sport 18's.