Get a fast car (does not need to handle well) - I use Toyota Celica fully tuned but don't want to start a fight!
Go to Special Event and enter Wagon Cup. There is a race there on the super speedway - its easy to come first (�6,000) and you get an Accord wagon you can sell for �6,000 as well.
A better one for the better driver is to enter the luxury 4 door cup (I use the Mazda RX7). Go for the Hight Speed Link, it's quite easy to come first (�10,000) and you get a car worth �12,500 every time.
Let me know if you find any more.
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