Unlock All Cars In Career Mode, Plus All Tracks.
Go into Extras, and open the Cheat enabler and
type the words HARD, Once cheat is activated go
back to main menu and go in to career mode and
look at your new collection.
Unlock All Race Modes In Arcade
Go to the cheat menu and type in "PIES". The
should be a confirmation saying you typed the
cheat in correctly, thereby unlocking all races
in arcade; yet they're all uncompleted.