Maximum Attributes:
On the Scenario mode's Garage screen, enter Down, Down, Up, Up, Right, Left,
Right, Left, SELECT, and your status levels will be maxed out in all categories.

Submission:
William A. Melfi III

Maximum Money:
On the Scenario mode's Garage screen, enter Up, Up, Down, Down, Left, Right,
Left, Right, SELECT, and you will instantly have 99,999,900 monetary credits!
That should buy a few parts!

Submission:
William A. Melfi III