Win all of the tournaments to unlock the Mega Cup tournament. Win the Mega Cup to unlock the BMW V12 LMR and Panoz Roadster at the "Purchase Car" screen. These cars are the fastest in the game and have unlimited power bursts.
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We have Test Drive 6 cheats for PlayStation, Dreamcast, PC, and Game Boy on CheatCodes.com. Give them a try, since cheats for other game systems sometimes work on Game Boy games, too!