Do you have a widebody? If not 17x10 will not fit the rear. It will stick out 3 inches past the fenders. Because of the rear strut knuckle, the 17" wheel is not tall enough to go over the top of the knuckle. If you wanted to go 18" or above, you can go as wide as 9.5 in the rear with coilovers because the wheel offset and diameter will allow the wheel to clear the strut knuckle and move inboard more towards the coilover.
Here is what I am talking about. The 17" wheel will not fit over the strut mounting location. 18" and bigger will allow you to have a wider wheel because the offset can move the wheel over the top of the strut mount. You can see why I say you will need coilovers. Notice if the wheel moves inward, you will hit the stock springs.
This is Nosaint's car on here. He is running 19x9.5 in the rear:
[This message has been edited by IMSA GT (edited 04-06-2014).]