Press Up + Gas as soon as "Go" appears.
Game Shark Codes
Master Code (Must Be On) EC83F268 143CA034
Infinite Race Retries 4C8A4C94 1456E7A3
Unlock All Tracks & Seasons 4C8A51A8 1456E7A1
Unlock Crank 4C8A5174 1456E7A6
Unlock Greck 4C8A5170 1456E7A6
Unlock Siba 4C8A516C 1456E7A6
P1 Argos 4C8A4EC8 1456E79B
P1 Crank 4C8A4EC8 1456E79E
P1 Dusk 4C8A4EC8 1456E7A0
P1 Evalon 4C8A4EC8 1456E79A
P1 Greck 4C8A4EC8 1456E79D
P1 Siba 4C8A4EC8 1456E7A4
P1 Silkut 4C8A4EC8 1456E79F
P1 Thorn 4C8A4EC8 1456E799
P2 Gore 4C8A4ECC 1456E7B7