The cheat codes you can enter for each effect are dependent upon your game, so only some of the codes below will work.
All cars:
Enter XKIMCF, LEZEJD, or SAFREA as a code at the bonus screen.
All challenges:
Enter LSDUXH as a code at the bonus screen.
All championships:
Enter QTRRDJ as a code at the bonus screen.
All tracks:
Enter QTRIKX, TMYTKO, NIQHLT, NPXOOY, MPXOOY, or HZCGYP as a code at the bonus screen.
Enhanced damage:
Enter DAMAGE as a code at the bonus screen.
No damage:
Enter IHHBIV, OATRYU, or MMMFJL as a code at the bonus screen.
Pro Race Driver tracks:
Enter LQJFFA as a code at the bonus screen.
Realistic handling:
Enter SIM, VIBAKH or LJLZEL as a code at the bonus screen.
View credits:
Enter CREDITS or XQIXCJ as a code at the bonus screen.