The following are known Action Replay Codes for F-Zero X on Nintendo 64 (N64).

Device Compatibility: Action Replay & GameShark

Master Code – Must Be On
de0670000000

Have Boost From Start
d02c4dac003f
802c49250050

Infinite Lives
800e5ed90005

Infinite Shield
812c4b484326
812c4b4c4326

Unlock Everything
800cd3c80001

Time Always 00’00″00 / Place 1st
812c4bc00000
812c4bc20001