Press ~ during game play to bring up the console window. Activate the following cheats by entering the corresponding codes, then press ~ again to close the console window.

CHEAT FUNCTION - CHEAT CODE
Additional $5,000,000 - cheat money
100 points - cheat points
$5,000,000 and 100 points - cheat all
Level select - cheat quest <1-31>
All drivers unlocked - cheat drivers
All trucks unlocked - cheat trucks
All accessories - cheat accessories
All performance parts - cheat parts