You dont have to do anything to run 255's. The only thing is WHY? They run much better on a wider wheel such as a 17x9. If you run a 255 on a stock wheel, your steering response will be slower, and at high speeds youll feel a "floating" feeling from time to time. Just run a 245 on the stock rim.
06 GG Evo SE
I WANNA GO FAST