Need for Speed: Underground Cheats

Go to quick race...pick sprint and go to the very first race track but
when it says go turn strait around and go until it pushes you back into
the race then click restart race  and do the exact same except only go
past the race line and then rev up you care for 3 minutes and it will
lead you a strait way to win and you will unlock some thing every time
like the neon pulse lights and big mufflers and dark window tints

Use the following customizations to reproduce the Brian's Nissan Skyline from 2Fast2Furious:

When you are in drift mode you can get some extra points for doing doughnuts. Hold one direction and the handbrake and gas and let go of the handbrake after a second. You'll just sit there and do doughnuts. This won't get you massive points but it's something.

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 = Get Car
893neon = Get Car
899eclipse = Get Car
371impreza = Get Car
222lancer = Get Car
922sentra = Get Car
667tiburon = Get Car
334mygolf = Get Car
777rx7 = Get Car
350350z = Get Car
111skyline = Get Car
221miata = Get Car
2000s2000 = Get Car
889civic = Get Car
228supra = Get Car
342integra = Get Car
239celica = Get Car
973rsx777 = Get Car
allmylvloneparts = Unlock Level 1 Parts
allmylvl2parts = Unlock Level 2 Parts
seemylvl2parts = Unlock Level 3 Parts
driftdriftbaby = Unlimited Drift
slidingwithstyle = Unlimited Slide
givemenismo = Get Nismo

When you crash in a drag race in underground mode,
your license plate will disappear after the crash.
Cheats: Custom cars

When you are in drift mode you can get some extra points for doing doughnuts. Hold one direction and the handbrake and gas and let go of the handbrake after a second. You'll just sit there and do doughnuts. This won't get you massive points but it's something.

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 DELETE), and finally enter your desired cheat:

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 - Un1ock Car
899eclipse - Unlock Car
371impreza - Unlock Car
222lancer - Unlock Car
922sentra - Unlock Car
667tiburon - Unlock Car
334mygolf - Unlock Car
77peugeot - Unlock Car
777rx7 - Unlock Car
350350z - Unlock Car
111skyline - Unlock Car
221miata - Unlock Car
2000s2000 - Unlock Car
889civic - Unlock Car
228supra - Unlock Car
240240sx - Unlock Car
342integra - Unlock Car
239celica - Un1ock Car
973rsx777 - Unlock Car

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Menu Songs:

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Get Low - Lil Jon & the Eastside Boyz

Smashing the gas (Get Faster) - Mystika

Who's Who - Dilated People

Keep it comming - Nate Dogg

Body-Rock - X-ecutioners

Need For Speed - Petey Pablo

24's - T.I.

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Racing Songs:

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Doomsday - Overseer

Born too slow - The Crystal Method

Out of Control - Rancid

Two Lane Blacktop - Rob Zombie

Kimosabe - BT

The Only - Static-X

Broken Promises - Element Eighty

Fortress Europe - Asian Dub Foundation

Invisible - Hotwire

And the hero will drown - Story of the year

The wounders of you - Andy Hunter

Action Radius - Junkie XL

Quarter - Fuel

Sucked In - Jerk

Snapshot - Fluke

Ride - lostprophets

Supermoves - Overseer

Glitterball - FC Kahuna

Swallow - Blindside

Having a hard time completing a drag race? Strip your car of every performance upgrade except handling and brakes. Your opponents will automatically do the same thing. This makes it easier to make a perfect shift everytime. This will work in all races except the ones that say you have to have a fast car.

When you are in drift mode you can get some extra points for doing doughnuts. Hold one direction and the handbrake and gas and let go of the handbrake after a second. You'll just sit there and do doughnuts. This won't get you massive points but it's something.

It is possible to put bigger/smaller rims on cars, because the size in inches changes from car to car, e.g. the Honda civic level 3 rims are 19", the Mazda rx7 level 3 are 20", etc.
Install the rims you like on the car you have. Then, trade your car in for a car that has rims of that level bigger or smaller than your car. Return to the rim customization screen and pick the same rims on that car. Although they already are installed, you must reinstall them for the game to register the size change. Clicking on next will simply ask you if you want to install the rims, although they already are, say yes. Then, go and trade your car back for what you had and it will keep the rim size you put on. On some cars, bigger rims will make them go through the fenders.