Maximum Nitro:
Enter fillmeup as a code.
No damage:
Enter ontheroad at the cheat menu.
Faster pedestrians:
Enter urbansprawl at the cheat menu.
Increase car mass in arcade mode:
Enter hyperagro at the cheat menu.
Argo special move:
Enter dfens at the cheat menu.
Zone special move:
Enter allin at the cheat menu.
Roar special move:
Enter Rjnr at the cheat menu.
Chrome head:
Enter haveyouseenthisboy at the cheat menu.
Flaming head:
Enter trythisathome at the cheat menu.
Yellow smile head:
Enter getheadj at the cheat menu.
Pumpkin head:
Enter getheadk at the cheat menu.
Bunny head:
Enter getheadl at the cheat menu.
Snowman head:
Enter getheadm at the cheat menu.
Unlock all cities in arcade mode:
Enter crosscountry at the cheat menu.
Unlock Atlanta & Detroit:
Enter roadtrip at the cheat menu.
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Midnight Club 3: DUB Edition Cheats, Codes & Walkthrough/Guide/FAQ for Sony PSP from Cheat Code Central
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Midnight Club 3: DUB Edition Cheats at CheatingDome.com.