NASCAR Racing '99 (Nintendo 64)

GameShark and Pro Action Replay Codes

Note:
A GameShark or Pro Action Replay cartridge is required to use the codes featured below.

North American (NTSC) version

One lap to race:
800438B30009
D021FBAB0000
8021FBAB0008
D022359B0000
8022359B0008

Maximum gear ratios:
810C9E90 7F1E
810C9E82 707F

Track modifier:
80042EF3 00<00-FF>
All codes above from The Code Master

Official codes from InterAct.
Codes from The Game Shark Code Creator's Club.