Performance parts 1 :
Press L1, R1, L1, R1, Left, Left, Right, Up.

Performance parts 2:
Press R1, R1, L1, R1, Left, Right, Up, Down.

Visual parts 1:
Press R1, R1, Up, Down, L1, L1, Up, Down.

Visual parts 2:
Press L1, R1, Up, Down, L1, Up, Up, Down.

Get $1000 for Career Mode, RX-8 and Skyline in Quick Race Mode:
Press Left, Left, Right, Square, Square, Right, L1, R1

Get all circuit tracks:
Press Down, R1, R1, R1, R2, R2, R2, Square

Get every bonus:
Press L2, R2, L1, R1, Up, Down, Right, Left

Get a Hummer H2 Capone:
Press Up, Left, Up, Up, Down, Left, Down, Left

Get a Nissan Skyline:
Press Down, Down, L1, L2, L1, L2, L1, Down