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Dreamcast - Super Speed Racing cheats

Unlock Japanese driver
Finish the championship mode once

Unlock  BMW M3, Toyota Celica, Acura NSX, Toyota T100 cars:
Finish the championship mode at least 4 times

Rainy weather
Play in arcade mode, and go to transmission selection screen,
hold L + R + Down. Keep held the buttons until the track 
completes loading.

Always the same weather: never changes
Play in arcade mode, and go to transmission selection screen,
hold L + R + Up. Keep held the buttons until the track 
completes loading.

Super Speed mode and Bonus camera angle:
Complete the championship mode once.