Hot Wheels Turbo Racing - Platform: Playstation 1
      
Unlimited turbos
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At the main menu, press R2, L1, Square, Triangle, R1, L2, L1, R2 

Large tires
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At the main menu, press Square, Triangle, Square, Triangle, R1, 
R1, L2, L2 

Small cars
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At the main menu, press Square, R2, L2, Triangle, Triangle, L2, R2, 
Square 

"Dude" sounds
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At the main menu, press R2, R1, L2, R2, Square, Triangle, L1, R1 

Unlock TowJam car
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At the main menu, press Square, Triangle, L1, R1, L2, R2, Square, 
Triangle 

Flat shaded graphics
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At the main menu, press L1, R1, L2, R2, L1, R1, L2, R2 

Unlock Twinmill 2
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Enter TH4T_ROCKS as a Password.