Look, you can squeeze that big of a tire on there, but it is a bad idea, especially if you like to corner. I have seen this exact setup "slip the bead" when cornering... And trust me, you don't want that, that's when the part of the tire engaged to the rim literally rolls out, the wheel comes crashing down onto the pavement, and if you not going slow when it happens, you will probably wreck the car. I'm not saying it can't be done, or that people haven't loved the results, but I have seen what happens when it goes bad, and it is not worth it, not even close. You will also lose some high speed stability and a lot of cornering capability, the tires will wear faster, and the gains in traction will not be in line with the gain in tire width. And it does't look the same as when it on a wider wheel. I'm not disparaging Thark, but if you look at his next to one with the same tires and wider wheels, there is a big difference. Do it at your own risk, but its not something I would ever do again, I learned the hard way, and it sucked a lot. Best wishes with whatever you choose, but manufacturers make recommendations based on a lot of research and testing by engineers, there are reasons why they say not to do it.
The artist formerly known as SteedaMatt.