Nascar Thunder 2004 - Platform: Playstation 1

How to unlock peoples other cars:
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The first thing you do is go to race now. Then when you get 
to the race now settings set it for one player, and set the 
difficulty for medium. Then pick the driver that you want to 
get their cars for and win the race and you will unlock one 
of their cars. (note; you can't keep doing the same track 
with the same driver or else it won't work.) 

Unlock All Opening FMV Sequences:
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Select Features at the main menu. Select Create-a-Car, 
then enter the following names:

Seymore Cameos - Unlock All Opening FMV Sequences