http://www.cheatcc.com/psx2/gt3as.html

http://www.consolecheatcodes.com/playstation2/granturismo3cheats.html

http://cheats.ign.com/ob2/068/793/793799.html

http://cheats.ign.com/ob2/068/013/013846.html

http://www.gamewinners.com/Cheats/index.php/More:Grand_Theft_Auto_4:_Cheat_Codes

http://www.cheatcc.com/psx2/gt4.html

http://www.cheatscodesworld.com/playstation-games/gran-turismo-2-cheat-4996.html

http://www.cheatcodeschamp.com/index.php?module=cheats&cheat=16194

http://www.playstation2-cheats.co.uk/your_cheats/4406/218369/Gran_Turismo_3_ASpec_cheats.html

http://www.cheatmasters.com/cheats/30445/Gran_Turismo_PSP_cheats.html

http://ps3.absolute-playstation.com/playstation3-cheat-codes/gt5-prologue-ps3-cheats.htm

http://ez-board.net/hotnews/grand-turismo-3-cheat-codes-4you.html

http://www.gamefaqs.com/console/ps2/code/914983.html

http://www.cheatscodesworld.com/playstation-2-games/gran-turismo-4-cheat-367.html

http://cheats.gamespy.com/playstation-2-cheats/gran-turismo-4/

http://www.gamershell.com/faqs/1436/

http://www.gamewinners.com/playstation2/GranTurismo3.htm

http://cheats.gamespy.com/xbox-360-cheats/grand-theft-auto-4/

http://www.gamesradar.com/ps2/gran-turismo-3/cheats-guides-faqs/g-2005120717015259228515

http://www.cheatmasters.com/cheats/21848/Grand_Prix_2_cheats.html