Start game as usual. Prior to entering each of the following cheat codes, go to the [Main Menu], go to the [Statistics] sub-menu, go back again (pressing BACKSPACE), and finally enter your desired cheat:
Code - Result:
gimmesomecircuits - Unlock Circuits
gimmesomesprints - Unlock Sprint Circuits
gimmesomedrag - Unlock Drag Circuits
gimmeppablo - Unlock Petey Pablo
gotcharobzombie - Unlock Rob Zombie
havyamystikal - Unlock Mystikal
needmylostprophets - Unlock Lost Prophets
119focus - Unlock Car
893neon - Unlock Car
899eclipse - Unlock Car
371impreza - Unlock Car
222lancer - Unlock Car
922sentra - Unlock Car
667tiburon - Unlock Car
334mygolf - Unlock Car
777rx7 - Unlock Car
350350z - Unlock Car
111skyline - Unlock Car
221miata - Unlock Car
2000s2000 - Unlock Car
889civic - Unlock Car
228supra - Unlock Car
342integra - Unlock Car
239celica - Unlock Car
973rsx777 - Unlock Car
allmylvloneparts - Tune Car w/ Level 1 Parts
allmylvl2parts - Tune Car w/ Level 2 Parts
slidingwithstyle - Unlock Drifting Physics
seemylvl2parts - Unknown Effect
driftdriftbaby - Unknown Effect
givemenismo - Unknown Effect