Nascar Heat 2002 - Platform: XBox

Hardcore realism mode
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Press Up, Down, Left, Right, White, Up, Down at the main menu. 
Alternately, get a 100 point rating on a track to unlock the 
hardcore realism mode option for that track.
Information in this section was contributed by DonnedKey. 

Shoot paintballs
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Select single race or head-to-head mode. Press Up, Down, Left, 
Right, White, Up(2) at the "Race Day" screen. Use your horn 
(press Up) to shoot a paintball. Note: This also works in two 
player mode. Alternately, select practice mode and press Up, Down, 
Left, Right, White, Down(2) to enable paintballs. 

View credits
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Press Up, Down, Left, Right, White, Left(2) at the main menu. 

High suspension
---------------
Press Up, Down, Left, Right, White, Left, Right at the main menu.
Information in this section was contributed by Crnhskrs. 

Mini cars
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Press Up, Down, Left, Right, White, Down, Up at the main menu. 

Wire frame cars
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Press Up, Down, Left, Right, White, Right, Left at the main menu. 

Richard Petty
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Successfully complete all Heat challenges with a bronze or higher 
rating. 

Hint: Pace car
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After coming out of the pits, press Brake. Reverse back into the pits 
and hit the pace car at about 100 mph. If you hit it hard enough, it 
will move. Steer it into any oncoming traffic. 

Hint: Big air
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At Sears Point there is a hill with a huge Valvoline logo on it. Drive 
up the hill and you will fly into the air -- and your car may catch on 
fire. 

Go past the first hill at Sears Point (the one that if you go too fast 
you will ramp and hit the wall) to the Valvoline jump, but do not ramp 
it. Turn around and go to the left side of the screen next to the wall 
and accelerate. Go forward until you ramp (this jump can hurt your car 
more than the Valvoline jump). You can do 720s, nose dives, half flips,
etc.