I was just wondering what the largest Width of a tire is for V6's without any rubbing or any other problems. I have 18 x 10 for the rear and no issues but i was wondering what the largest width would be? 10.5 ? 11?

I know our wheel wells are pretty big but i was just curious.

 

It all depends on the offset and backspacing of the rims.
Whatever it is will be the same for a GT.

 

+1. The stock wheels are typically 16x7 on a plain V6.

Let us know what wheels you eventually get on there