I've been upgrading my set up little by little and ended up outta cash. i tried challenging the computer to see if i could earn cash but no dice. let me know, thanks!

I have a certain car, that I fixed up, that will most of the time beat the cpu. while Im working on other cars, I try not to let my money get below 2 thousand, that way I can put 2000 dollar bets and let my money build up. what all do you have on your ride.

how do you ear cash period?? it says i have 400 and i want to buy a car but it says the car is 5000