Unofficial Need For Speed: Underground Website.
Navigation:
Here are some cheats for NFS:U on all platforms.
Cars
XBOX
Racers
Enter the following at the main menu.
Unlock all drag tracks:
right, X, Left, R, X, L, White, Black

Unlock all drift tracks:
Left, Left, Left, Left, Right, Black, R, White

Unlock all Circit tracks:
Down, R, R, R, Black, Black, Black, X

Unlock all sprint tracks:
Up. Black, Black, Black, R, Down, Down, Down

Drift Physics in all game modes:
Left, Left, Left, Left, Right, Back, R, White

Unlimited Nitrous Boost:
A, B, Y, Y, A, A, B
Gallery
Cheats
Links
Guestbook
PS2
P.C.
Go to the main menu and then the statistics menu and then go back again pressing backspace, after that enter the following:

gimmesomecircuits      all circuits
gimmesomesprints       all sprints
gimmesomedrag          all drags
gimmeppablo               unlok petey pablo car
gotcharobzombie         rob zombies car
havyamystikal             mystykal car
needmylostprophets     lostprophets car
givemenismo               nismo sentra

199focus              focus
893neon                neon
899eclipse             eclipse
371impreza           wrx
992sentra              sentra
667tiburon            tiburon
344mygolf            golf
777rx7                  rx7
350350z                350z
111skyline             skyline GT_R
221miata               mx5
2000s2000            s2000
889civic               civic si coupe
228supra              supra
342integra             integra typeR
239celica              celica GT-s  s
973rsx777             rsx

seemylevel2parts        level2 parts
driftdriftbaby             drift tracks
slidingwithstyle          drift physics
Enter all of the following in the main menu:

all drag tracks
->, square, <-, R1, square, L1, L2, R2

all drift tracks:
<-, <-, <-, <-, ->, R2, L1, L2

all cicuit tracks
down, R1, R1, R1, R2, R2, R2, square

all sprint tracks
up, R2, R2, R2, R1, down, down, down

Drift physics
R1, up, up, up, down, down, down, L1

unlimited Nitrous
X, circle, triangle, triangle, X, X, circle
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