http://www.neoseeker.com/Games/cheats/PS2/granturismo3.html

http://cheats.gamespy.com/playstation-2-cheats/gran-turismo-3-a-spec/

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

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

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

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

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

http://www.supercheats.com/playstation2/granturismo3aspeccheatcodes.htm

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

http://www.gamespot.com/ps2/driving/granturismo3aspec/hints.html