At the main menu, press Left(3), Right, Left, Down, Right, Down, Square.
Game Shark Codes
Master Code (Must Be On) EC88A4BC 14443A68
All Bikes/Outfit - CM 4CB825A0 1456E5A2
All Bikes/Outfit - DM 4CB8F640 1456E5A2
All Bikes/Outfit - JG 4CB810B8 1456E5A2
All Bikes/Outfit - KH 4CB80B28 1456E5A2
All Bikes/Outfit - LE 4CB81D10 1456E5A2
All Bikes/Outfit - LR 4CB80CF0 1456E5A2
All Bikes/Outfit - RM 4CB81480 1456E5A2
All Bikes/Outfit - RN 4CB8FB08 1456E5A2
All Bikes/Outfit - SJG 4CB82D30 1456E5A2
All Bikes/Outfit - SW 4CB821D8 1456E5A2
All Bikes/Outfit - TL 4CB81848 1456E5A2
All Bikes/Outfit - TM 4CB80760 1456E5A2
All Bikes/Outfit - TMM 4CB8FFD0 1456E5A2
All Bikes/Outfit - ZS 4CB82968 1456E5A2