That is your best bet. On Pony R's site, it says right in there, you will need to modify your frame rails, roll fender lips, and remove quads. With all the technology going into tires nowadays, wider isn't always better.
Rolling fender lips is okay to do, but if your car is nice and painted already, I would forget about doing that unless you get that special fender roller. I used a sludge hammer...(gently) and it came out good, but my car needed paint anyways. I would NOT to that to a car that is already good.