How do you unlock all of the karts in Mariokart Wii?

go to the Mario Kart wii menu and click on any file so when you get to that place with gran prix click on it and when you click on it after the next screen comes up hold 2 1 b a and + then the whole screen turns white and it says dun dun dun so you get like the dolphan dasher and the phantom and all the cars.

it took me years to figure this out thanks for typing my question my e-mail is slipjohnathan@Verizon.net