At the main menu, select "EA Sports Extras", then "Cheat Codes". Then, enter one of the following codes to activate the corresponding cheat function:
Enter "CHECKERED FLAG" as a code to unlock all cars in Chase mode. -From: Brian Krebs
Enter "RACE THE PACK" as a code to unlock all fantasy drivers.
Enter "EA SPORTS CAR" as a code to unlock the EA Sports 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
Select Race Now mode, choose a truck race, set the length to 100%, and choose Bristol as the track. Turn all damage, flags, and wear off. Start the race and drive. You will literally drive through the other trucks on the track. The race is 200 laps and should only take about 45 minutes to complete. When you win, you will be at least 20 laps ahead and get an easy 100 Gamerscore points.
Accomplish the indicated achievement to get the corresponding number of Gamerscore points: