I have '03 Track 350z. She has stock tires on right now but rear tires are pretty much completely bald. Front one's are ok. I was wondering if I should just get two rear ones first. 245/45/18 is the stock rear tire size but would it be okay to get 255's instead? Opinions PLEASE!!!! I'd like to know pro's and con's if I do get wider tires in the back. THANKS~!