Super Gamer Dude
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.