I am just going with what Carey told me as to the size of the wheel being 15". I don't know if a 16" or 17 wheel will fit, and if you can get one to fit you would probably have to use a very low profile tire, which would adversely effect drivability and comfort. Remember, this is not a track car.
As far as the brakes go, their standard brakes are 4 wheel discs. I know they offer an upgraded track brake package, but I do not intend to track the car. He has not said anything in terms of needing to upgrading the brakes. But if he tells me I need to because of the increased power, of course, I will follow his recommendation.