I've beaten the game three times so trust me on this one. To get a fudge-load of money, do this. Once you have unlocked the Nissan Skyline GTR, right before the four round drag tournament, trade your current car for a Skyline, if you already haven't and change all of the parts to stock. For the rims, just get one of the level 1 styles. Once you have done this, trade your skyline for a VW GTI. You should probably gain about 17,000 money by doing this. Next, fully upgrade the GTI and trade it for a skyline. By doing this you should lose 3,000 money. To repeat this process completely turn the car into stock and so -on