http://www.gamerevolution.com/cheat/ps2/gran-turismo-3-a-spec

http://www.supercheats.com/playstation/granturismo3cheats.htm

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

http://www.gamefaqs.com/console/ps2/code/197470.html

http://vgstrategies.about.com/od/ps2cheatscodesg/a/gt3aspeccheats.htm

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

http://www.supercheats.com/playstation/granturismo3cheatcodes.htm

http://www.cheatmasters.com/actions.php?id=132

http://www.psxextreme.com/ps2-cheats/50/Gran-Turismo-3-A-Spec-(GameShark-2-codes).html

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