At the main menu, select "EA Sports Extras", then "Cheat Codes". Then, enter one of the following codes to activate the corresponding cheat function:

All cars in Chase mode

Enter "CHECKERED FLAG" as a code to unlock all cars in Chase mode. -From: Brian Krebs

All fantasy drivers

Enter "RACE THE PACK" as a code to unlock all fantasy drivers.

EA Sports car

Enter "EA SPORTS CAR" as a code to unlock the EA Sports car.

Wal-Mart track and car

Enter "WALMART EVERYDAY" as a code to unlock the Wal-Mart track and car.

When qualifying for a Daytona or Talladega race, turn off braking assists. This will allow your car to reach maximum speed, resulting in a pole position every time. This works in all race modes.

Select the Gold (Hard) challenge for Follow The Leader. When the race starts, find the best spot to ram your car into the wall (head-on works best). You have to hit hard enough to destroy the suspension or you will get a "Failed" message, saying you hit the wall too much. If done correctly, you will pass the challenge. -From: Tribal