Edit car and part prices:
This procedure involves editing a game file; create a
backup copy of the file before proceeding. Use a text
editor to edit the "garage.ini" file in the game directory. 

Extra Money:
This procedure involves editing a game file; create a
backup copy of the file before proceeding. First use a text
editor to edit the "menu.ini" file in the game directory. Edit
the amount of money in a current saved game. Start the
game, load the edited save game, then save it in the same
slow with a different name. Restart and load the saved
game one final time to collect the extra money.