All cars
Enter "AGEM" or "MPBA" as a password.
All races won as Emilio
Enter "NIML" as a password.
All races won as Keiko
Enter "LGKG" as a password.
Multiple cars
Enter "CLSB" as a password to unlock the Crusero Bueno, Crusero Excellente, Crusero Magnifico, Jonesj400, Jonesj420, Jonesj450, Piranhapdq, Piranhapdq R, Piranahapdq Ari, Modicum Xsv, Modicumxsz.5, and Modicumxsv.25.