New to the site and hopefully a new 300C owner soon. I have a question after having test drove the car yesterday. Does altering the wheel and tires effect the MDS system? If part of the logistics of that system involve the rolling diameter of the wheel and tire, doesn't changing that effect the efficiency of the system? Can you change the setup as long as you keep the same rolling diameter or does weight effect it too? If you can...do you put 22s and 30-series tires, or 20s and 40-series? I know that's going to be preference but I would prefer to have those functions of the car perform as close to design as possible. Any help would be awesome. Thanks in advance.