The codes should work with the region specified but may work for other regions as well.
Device Compatibility: Action Replay, CodeBreaker & GameShark
Stop Race Timer
800b0a940000
Infinite Boost/Special Move
800c353201a4
Alway First Place
d10c35720000
800c35720001
Have All Cars
800e02bcffff
800e02beffff
Unlock Studio Track
800e02560161
Unlock Arches Track
800e025e0161
Unlock Fraggle Track
800e02660161
Unlock Disco Track
800e026e0161
Mega Jump
800c35880040