Edit Car and Part Prices:
This involves editing a game file; you should always create a
backup copy of the file before doing anything like this. Use
a text editor to edit the "garage.ini" file in the game directory.
Extra Money:
This involves editing a game file; you should always create a backup
copy of the file before doing anything like this. 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.