NASCAR Thunder 2003 "MP3 Add-on"
While going through the game menus, you can listen to music you wish to hear if you want. Just copy over some of your favorite MP3s to the "Music" directory. The music will be randomly picked to play while you are browsing the menus. As far as I can tell, there should be no reason you can't have as many MP3s used in the game as you want.
Submitted by BigGayAL