Need for Speed Underground [cheats]

Start game, go to the main menu, go to the Statistics sub-menu, go back again (pressing DELETE), and finally enter your desired cheat:

240240sx - Unlock 240SX
350350z - Unlock 350Z
allmylvloneparts - Unlock All Level 1 Parts
allmylvl2parts - Unlock All Level 2 Parts
239celica - Unlock Celica
gimmesomecircuits - Unlock Circuits
889civic - Unlock Civic
gimmesomedrag - Unlock Drag Circuits
Slidingwithstyle - Unlock Drift Physics in all the game modes
899eclipse - Unlock Eclipse
119focus - Unlock Focus
371impreza - Unlock Impreza
342integra - Unlock Integra
222lancer - Unlock Lancer
allmylvloneparts - Unlock Level One Upgrades
allmylvl2parts - Unlock Level Two Upgrades
needmylostprophets - Unlock Lost Prophets
221miata - Unlock Miata
334mygolf - Unlock Mygolf
havyamystikal - Unlock Mystikal
893neon - Unlock Neon
gimmeppablo - Unlock Petey Pablo
77peugeot - Unlock Peugeot
gotcharobzombie - Unlock Rob Zombie
973rsx777 - Unlock RSX
777rx7 - Unlock RX7
2000s2000 - Unlock S2000
922sentra - Unlock Sentra
111skyline - Unlock Skyline
gimmesomesprints - Unlock Sprint Circuits
228supra - Unlock Supra
667tiburon - Unlock Tiburon
2000s2000 - Unlock Updated Honda 2000
899civic - Unlock Updated Honda Civic
342integra - Unlock Updated Honda Integra
973rsx777 - Unlock Updated Mazda RX7
239celica - Unlock Updated Toyota Celica
228supra - Unlock Updated Toyota Supra

Unlimited Money Without Racing
First you must obtain the "Nissan Skyline" then you have to atleast unlocked 3/4 of all the performance upgrades(Note: Having all of them will allow you to make more money)Get rid of the performance parts that upgrade the Skyline's top speed and change the turbo package back to stock. The performance stats should read "S, S, 3, S, S, 3, 3, 3, S". (Or it might be different if you haven't obtained all performance parts) Then trade it in for the Mazda Miata getting a rebate of $12727 afterwards re-equip everything onto the Miata then trade it in again, this time for the Nissan Skyline getting a rebate of 119 dollars. Then just repeat the whole process again and again each time getting $12846 each time so you can buy all the Visual Parts and Performance Parts quickly.
-from EternalBlade

Unlock All Visual Upgrades
All Accessories - Complete Underground mode.
All Body Parts - Complete Underground mode.
All Decals - Complete Underground mode.
All Paint - Colors Complete Underground mode.
All Rims - Complete Underground mode.
All Vinyl - Complete Underground mode