GameSpy: Gran Turismo 4 -- Everything We Know - Page 5

GT4 has cheat codes

Gran Turismo 1 2 3 4 A Spec Save Collection PS1 PS2 100% Completed Cheats

After 20 Years Cheat Codes Have Been Found For Gran Turismo 4

Gran Turismo 4 Cheats Took 20 Years To Discover

Almost done with Gran Turismo 4. All that's left is mission 34. And I'm on the NTSC version of the game. : r/granturismo

Complexo GT - GT4 Dicas Cheats e Fórum: Dicas do Gran Turismo World Championship

Gran Turismo 4 Box Shot for PlayStation 2 - GameFAQs

Gran Turismo 4 Cheats, Codes, Cheat Codes, Walkthrough, Guide, FAQ, Unlockables for PlayStation 2 (PS2) - Cheat Code Central

The 10 Wildest Cheat Codes and Secrets in Racing Game History

Working on a prize car randomizer for GT4. It's quite fun seeing which path the prizes set you on. : r/granturismo