Midnight Club 3: DUB Edition - Maximum Nitro

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.