Ridge Racer T4 Cheats for Playstation

Bonus vehicles:

Unlock all 320 cars in the game. Then the Pac-Man character and the Sony Eatem Up car can be selected in time attack mode.
Turbo Boost:

When you are playing on any race, press R2 + L2 for a super turbo boost.
Four player mode:

Connect two PlayStations via a link cable. A "Link Battle" mode that allows a simultaneous four player game will appear.
Extra Trial mode:

Successfully complete the game in Gran Prix mode.
Turbo (Japanese version):

Press L2 + R2 during game play.
Rage Racer information:

Use a memory card with a saved game file from Rage Racer to place your old team information on the cars in Ridge Racer Type 4.
Soundtrack:

Play the game disc in an audio CD player. The voice and music from the game can be heard on tracks two through nine. To hear additional music from the game, listen to tracks two and above on the turbo mode disc.
All cars:

Press Start to pause game play at the half way point in the first race in Gran Prix mode. Then, press Square, Square, Square, Circle, Circle, Circle, Circle, Triangle, Triangle.
All cars (japanese version):

Press Start to pause game play at the half way point in the first race in Gran Prix mode. Then, press Triangle, Tringle, Tringle, Circle, Circle, Circle, Circle, Square, Square.