All levels:-  Go to the options menu, go to "Change Name", and enter XOPENSEZ.

Custom corvette mode:-  Win all C3 career mode races.

Route 66 Checkpoint Mode:-  Win all C5 career mode races to unlock this race mode.

Circuit Endurance Mode:-  Win all the C4 career mode races to unlock this race mode.

Hot Lap Challenge Mode:-  Win all the C2 career mode races to unlock this race mode.

Custom Corvette Mode:-  To get custom corvette mode, you have to win all the races in C3 career mode.

Gameshark Codes

Enable Code (M)
4336FA9 4DFEFB79  09836A23 11AEA8D7  A3BA9E6E BBEFA72F  D913466A 11A31D37

Always Low Lap Time 392C5076 5F1EE48F  229D5811 1CB25AEE

Access Any Race 780D1C77 95CBE0A9