Fourth color set:
At the mode selection screen, press Down, Left, Up, Right, X, Y, L, R.
Random weather in time attack mode:
At the mode selection screen, press R, X, X, X, X, X, X, X, Y, Y, Y, Y, Y, Y, Y.
Unlock the LE-2001 truck:
At the mode selection screen, press Y, X, Right, Left, Right, Left, Down, Down, Up, Up.
Unlock the T4 fighter jet:
At the mode selection screen, press Left, Right, Down, X, X, X, X.
Super expert mode:
At the mode selection screen, press Left, Left, Right, Right, Left, Right, X, Y, Y, Y, Y, Y, Y, Y, Y.
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Buggy Heat Cheats, Codes & Walkthrough/Guide/FAQ for Dreamcast from Cheat Code Central
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Buggy Heat Cheats at CheatingDome.com.