To Unlock All Vehicles,Track, Stats, and more, use these
codes as names in the create profile section: 
Name your rider the following

Code             Result
------------------------------
redrooster     - All Championships
generallee     - All Bikes
gingham        - Maxxed out Statts
doublebarrell  - All Challenges
bubba          - All Riders
roadkill       - All Tracks
fiddlerselbow  - Maxxed out Skill Level