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Sony PSP - Street Supremacy cheats

Completion bonus:
Finish the game once then save. Reload you saved game file. You can 
play a new game with all of your data from the previous game.
Handling is better in the continued game.

Getting money easily:
Once you become the leader of your team, challenge another team. 

Make all your teammates the lowest ranking drivers. Once they all 
lose, you will get a chance to race and win up to $10,000/race. 
There are 5 races, allowing you to earn up to $50,000/team race.