370z touring widest possible tire setup?

[Bxbori238]

I got an 09 370z touring and I have to replace the rear tires, I currently have 245 45r 18, made by yokohoma on the stock 18" rims, I want to get the best handling, stickiest all season tires I can possibly put on them, I was thinking about putting 265 instead of 245, if it's going to make the performance worse I won't do it. I don't know much about tires so that's y I need advice. Which tires brand and size i could best go for. I notice that the sport version come stock with wider tires, and If I can actually put a lil wider than 245 in the rear without degrading the performance, I just want to be safe tho.