All tracks:
Press Down, B, X at the main menu.

Drive for free:
Press Left, X, A at the main menu.

$6,000,000:
Enter JFKBBBBBBBBBBJFK as a password.

Super password:
Enter WDJCFBRPRLJBWFDL as a password for $4.8 million, all car parts, and the Cabrio.

Unlimited turbos:
Allow the demonstration that follows the title screen to go to completion. Begin game play after the title screen re-appears to have unlimited turbos.