Unlock Cheat Menu:
Press L2, R2, L1, R1, Up, Down, Right, Left when 'Press Start' appears at the 'Title' screen. If you have entered the code correctly you will hear a confirmation sound and ALL the bonuses will be unlocked.
Cheats:
1987 Toyota Corolla GTS (AE86) - Unlocked at the Start.
RWD, 112 hp, 6600 rpm, 97 lbs. Torque.
1992 Nissan 240SX - Unlocked at the Start.
FWD, 155 hp, 5600 rpm, 160 lbs. Torque. 1999 Mazda Miata - Unlocked at the Start.
RWD, 128 hp, 6500 rpm, 110 lbs. Torque. 2000 Honda Civic Coupe Si - Unlocked at Start.
North America only, FWD, 160 hp, 7600 rpm, 111 lbs. Torque.
2003 Ford Focus ZX3 - unlocked at Start.
FWD, 130 hp, 5300 rpm, 135 lbs. Torque.
2002 Lexus IS300 - Unlocked in Level 3.
RWD, 215 hp, 5800 rpm, 218 lbs. Torque. 2003 Acura RSX Type S - Unlocked in Level 3.
North America only, FWD, 200 hp, 7,400 rpm, 142 lbs. Torque.
2003 Hyundai Tiburon GT - Unlocked in Level 2.
FWD, 181 hp, 6000 rpm, 177 lbs. Torque. 2004 Peugeot 106 - Unlocked at the Start.
Outside North America only, FWD, 120 hp, 5500 rpm, 107 lbs. Torque.
2004 Audi A3 - Unlocked in Level 3
AWD, 250 hp, 6300 rpm, 236 lbs. Torque.
2004 Audi TT Quattro - Unlocked in Level 3
AWD, 250 hp, 6300 rpm, 236 lbs. Torque.
2004 Cadillac Escalade - Unlocked in Level 2.
AWD, 145 hp, 5200 rpm, 380 lbs. Torque.
2004 Hummer H2 - Unlocked in Level 2.
AWD, 325 hp, 3600 rpm, 385 lbs. Torque;
2005 Ford Mustang GT - Unlocked in Level 4.
RWD, 300 hp, 5800 rpm, 315 lbs. Torque. 2004 Infiniti G35 - Unlocked in Level 4.
RWD, 280 hp, 6200 rpm, 270 lbs. Torque.
2004 Lincoln Navigator - Unlocked in Level 2.
RWD, 300 hp, 5000 rpm, 355 lbs. Torque;
1995 Mazda RX-7 - Unlocked in Level 4.
RWD, 255 hp, 6500 rpm, 217 lbs. Torque.
2004 Mazda RX-8 - Unlocked in Level 4.
RWD, 238 hp, 8500 rpm, 159 lbs. Torque. 1999 Mitsubishi 3000GT - Unlocked in Level 4.
AWD, 320 hp, 6000 rpm, 315 lbs. Torque. 1999 Mitsubishi Eclipse - Unlocked in Level 3.
AWD, 210 hp, 6000 rpm, 214 lbs. Torque.
2003 Mitsubishi Lancer - Unlocked in Level 4.
AWD, 271 hp, 6500 rpm, 273 lbs. Torque. 2003 Nissan 350Z - unlocked in Level 4.
RWD, 287 hp, 6200 rpm, 274 lbs. Torque.
2003 Nissan Sentra SER Spec-V - Unlocked in Level 2.
FWD, 175 hp, 6000 rpm, 180 lbs. Torque.
1999 Nissan Skyline R34 GTR - Unlocked in Level 5.
AWD, 276 hp, 6800 rpm, 216 lbs. Torque. 2003 Peugeot 206 - unlocked at the start.
FWD, 138 hp, 6000 rpm, 143 lbs. Torque. 2004 Pontiac GTO - Unlocked in Level 4:
RWD, 350 hp, 5200 rpm, 365 lbs. Torque.
2003 Subaru Impreza WRX STi - Unlocked in Level 5:
AWD, 300 hp, 6000 rpm, 300 lbs. Torque.
2003 Toyota Celica GT-S - Unlocked Level 2:
FWD, 180 hp, 7600 rpm, 130 lbs. Torque. 1998 Toyota Supra - unlocked in Level 3:
RWD, 225 hp, 5800 rpm, 210 lbs. Torque. 2004 Vauxhall Corsa - Unlocked at the Start:
Outside North America only, FWD, 125 hp, 6000 rpm, 122 lbs. Torque.
2003 Volkswagen Golf GTI 1.8T - Unlocked in Level 3:
FWD, 180 hp, 5500 rpm, 173 lbs. Torque.
Upgrade Codes
The following codes are entered at the 'Start' screen
Unlock Visual Level 1:
R1, R1, Up, Down, L1, L1, Up, Down.
Unlock Visual Level 2:
L1, R1, Up, Down, L1, Up, Up, Down. Unlock Performance Level 1:
L1, R1, L1, R1, Left, Left, Right, Up.
Unlock Performance Level 2:
R1, R1, L1, R1, Left, Right, Up, Down.
Misc. Codes
The following codes are entered at the 'Title' Screen
Unlocks A Hummer H2 Capone:
Up, Left, Up, Up, Down, Left, Down, Left.
All Circuit Tracks:
Down, R1, R1, R1, R2, R2, R2, Square.
Burger King vinyl:
Up, Up, Up, Up, Down, Up, Up, Left.
Unlocks the ShineStreet Lexus IS300:
Up, Down, Left, Up, Left, Up, Right, Left.
Unique Vinyl Down, Up, Down, Left, L1, L1, L1, Down.
Unlocks the Best Buy car Vinyl:
Up, Down, Up, Down, Down, Up, Right, Left.
Unlocks Nissan Skyline:
DOWN, DOWN, L1, L2, L1, L2, L1, DOWN.
$200 in career:
Up, Up, Up, Left, R1, R1, R1, Down.
$1000 in career. RX-8 and Skyline in Quick Race:
Left, Left, Right, Square, Square, Right, L1, R1.
Thats all the cheats I bothered to find.
All cheats posted above were copied and pasted from the URL http://www.supercheats.com/...odes.htm