Mario Andretti Racing (Genesis)
CheatingDome.com
Circuit Cars
For (fully stocked) circuit cars enter this code at the password screen: 2VP8 ZLFE WKDN CSXH TDAB
Mucho Dinero
To start the game with $403,000 (and 600 points) enter this code at the password screen: CS2Q-FEBA-EDAV-BUPH-TFAA
Sprint Cars (Level 5)
For (level 5) sprint cars enter this code at the password screen: EUJQ QFUW SDBY AMAF 3MAA.
Stock Cars
For (tricked-out) stock cars enter this code at the password screen: KVUE WLD2 WQC6 BAVH TJAA