Midnight Club 3: DUB Edition (PS2)

General Cheats
Enter the Following cheats it the Cheat Menu for some easy pickings:

All cities in arcade mode: ROADTRIP
Argo special move: DFENS
Bunny head: GETHEADL
Chrome head: HAVEYOUSEENTHISBOY
Faster pedestrians: URBANSPRAWL
Flaming head: TRYTHISATHOME
Increase car mass in arcade mode: HYPERARGO
No damage: ONTHEROAD.
Pumpkin head: GETHEADJK
Roar special move: RJNR
Snowman head: GETHEADM
Yellow smile head: GETHEADJ
Zone special move: ALLIN

Unlock Cars
Following the instructions to unlock some new carS:

Lexus GS 430 + Cadillac CTS-V: Go to the cheats screen, and enter "rimbuk" with the onscreen keyboard.
H1: Go to options screen, then cheats, and enter "Kubmir" with the onscreen keyboard (rimbuk backwards).
Atlanta + Detroit Cop Cars: complete the game.
El Diablo Rigid: defeat vanessa three times in career mode.
Nissan Skyline: complete all 13 tuner race tournaments.
Skully bike: complete the Chopper of America Bike Club races.
Chrysler 300C "DUB edition": Win the Balboa Park tournament in San Diego.
Cadillac Escalade EXT "Dub Edition": Win the Hotlanta tournament in Atlanta.
Cadillac Escalade ESV: Win the second San Diego tournament.