Cheats:

 Type in these codes at the mode selection screen (the one with
 the nice girls:

 MRTRK                 - All tracks
 TACAR                 - Team A gets an extra car
 TBCAR                 - Team B gets an extra car
 TCCAR                 - Team C gets an extra car
 TDCAR                 - Team D gets an extra car
 TACARTBCARTCCARTDCAR  - Extra car for any team
 CHMPA                 - League mode

 From Jean-Philippe Naquet, jpnaquet@dassault-elec.fr