There are a lot of threads on this if you search around, but here is a quick I out from my perspective/experience.
I do a few track days here and there but have been getting heavy into autocross. I run KW V3 coilovers which are great for daily driving and do okay for the track but are so soft with their progressive springs for true hard track driving. A lot of people end up going with coilovers that they can choose custom spring rates (much higher than those offered by off the shelf coils) based on their aero and other factors. I'm also running a hotchkis front sway bar and eibach rear sway bar. I'd stick with hotchkis front which is one of the stiffest and OEM rear. You'll also want adjustable camber arms, the best being from SPL. I use SPC because my class restricts me and I can't have spherical joints. They tend to slip a bit and my camber tends to change a lot throughout the season which isn't great. As for tires, with the stock nismo wheels you can fit something like a 285/35r19 extreme summer tire (RE71R or RS3) and the extra width out front will help you out greatly with understeer. Those tires are pretty good until you move on to the big leagues and start looking at slicks/semi slicks.
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