I went with the 18x9.5 +20 with 245/40/18 and 275/40/18 and havent had any problems rubbing on stock height, I will go wider next set of tires =] No problems with oversteer either, those sizes should be exactly what youre looking for.

 

Doesn't seem like you did any research at all OP, these are really basic questions that could have been answered by searching.

Read this thread:

https://my350z.com/forum/2003-2009-n...questions.html

Your question would have been answered within it here:

https://my350z.com/forum/2487452-post8.html