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Playstation 2 - Moto GP 4 cheats

Unlock BMW 645C1 Pace Car:
Playing and win the 125cc Championship

Unlock everything:
Press Up + R2, Right + R1, Down + L1, Left + L2, L3 + R3 at the main menu 

Unlock Legends mode:
Win the following championships to unlock legends modes:
125cc, 250cc, and MotoGP