[drburton]

I went to a wider rear tire and left the front the same. Going wider in the front could cause some rubbing issues if you have the wheel turned all the way (for example in a parking lot). In the rear you should be fine with a 275. I don't think there will be too much of a change in performance, but will improve the appearance. Maybe a bit more grip at launch.

Be careful with how the width impacts the circumference of the tire. If you go wider you generally need to have a shorter sidewall. So in the rear, you should probably go with a 275/35/18.