By 
press #1379* in main menu.
press # during the game to win nitro
press 0 to win the race
Career menu press # to increase your level.
Tips
– When you are in a dual you have to get 10 seconds above your opponent to get three stars. If that just cannot happen then when you pass a time marker pause the game. Wait 10 seconds and resume the game. The game will think ten seconds have passed for the computer.
– Try and mix up your approach. Drifting around corners is both a good way to stay ahead of the pack and built up your boost.
– Look out for dollar signs on track – these add to your winnings.
– complete as many missions as you can in Career Mode to earn stars. The more stars you earn, the better as stars can be earned by drifting or eliminating your rivals. Just be careful not to wreck your car, or you’ll lose more than you gain!
– When adrenaline mode is activated, pick up additional boost to extend your time.
