To unlock the final Lightning Challenge, win 8 Championships in Career Mode. The Challenge then becomes available on the "Lightning Challenge" menu.
To unlock the 3 Thunder plates that give you video content, play Career Mode until you win 1, 5, and 8 Championships.
You must enter the first two codes at the Create A Car screen, The first word in these codes goes in the first name slot and the second word goes in the last name slot. For the las t one you simply need a memory card.
Dale Earnhardt- Type in "Dale Earnhardt"
Fantasy Drivers- Type in "Extra Drivers"
Tiburon Speedway Track- Use a memory card with a saved file from an EA sports 2003 game.
For the ones where you type in the name you dont type in the quotation marks.
To get new paint schemes and racetracks, you need to win a race on veteran or legend.