Nice Balls:
    Pause the game during a race and go to race statistics. Press  R1, R2, L1, and L2 at the same time and  you should here an engine rev up.Go back to the race and  push the Triangle button to spew colored balls.

Turbo mode:
    Go to Game Options. Hold O, then press Up, Left, Down, Right. It should say "Go Buddy" and 'turbo  mode on' will appear at the bottom of the screen. This makes  you go 30 miles an hour faster, but it  doesn't show on the speedometer.

To get the EA sports car:
    Go to the Kenny Wallace car, hold X and press Up, Down. Hold X until the race starts and you will be   drivin' the EA car...

To get the Black Pinnacle car:
      Go to Bobby Labonte and hold the X button and press Up, Down.