Complete one of the following series with the corresponding setting to enable a bonus car:

Arcade Basic series (Novice)-Porsche 959
Arcade Basic series (Expert)-Ferrari F-50
Arcade Pro series (Novice)-Ferrari 512 TR
Arcade Pro series (Expert)-Dodge Viper GTS
Normal Championship series (Novice)-Bugatti EB110 GT
Normal Championship series (Expert)-McLaren F1