Have 1,000,000,000 money
Get the Skyline (in racing form)
Get the Supra (in racing form)
Get the Twin Turbo (in racing form)
Get the Dodge Concept car for free
Win EVERY CAR!
Win Route eleven
Then do HighSpeed ring
then type OOsquareXOsquaresquareXXXOXsquareOOOXO
Then you will be able to earn: 1,000,000,000,000,000,000,000,000,000,000,000,000,000,0000,000,000,000 money
earn that much and you will get double the amount!
Have International A license
Have 200 Dodge Viper /gts'es
Have Grifith 4.0
We have more cheats and tips for this game here, Gran Turismo cheats
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