Amped 3 Codes -

Cheat mode
Select "Options" at the main menu, then choose the "Cheat Codes" option. Enter one of the following codes at the "Cheat Codes" screen to activate the corresponding cheat function:

, , , , , , , , , - All sleds
, , , , , , , , , - Full awesome meter
, , , , , , , , , - Unknown Effect

Unlock Warlord Car
To unlock the Warlord car (also known as the most awesome car in Full Auto, with full armor and speed stats), you must earn a Full Auto medal for the Armageddon event in the Warlord career mode chapter.

When you chose the weapon combo, choose the assault weapons set the machine guns to level 3 and the mines to level 1. Hang back at the rear of the pack, kill all your opponents, and finish first you should be able to unlock the Warlord which is the best car in the game.

Unlock Enforcer Cop Car
To unlock the Enforcer cop car, simply complete the Swift Justice event in the Speed Kills career mode chapter.

Unlock Wraith
Earn any medal in the Killer Curves event.

Unlock Demon
Earn any medal in the Rod Rage event.

Unlock Vulcan
Earn any medal in the Catch My Drift event.

Unlock TEC
Earn any medal in the Over/Under event.

Unlock Magnus
Earn any medal in the Heads Up event.

Unlock Ardent
Earn any medal in the Boxed In event.

Unlock Honcho
Earn any medal in the King of Bling event.

Unlock Roughneck
Earn any medal in the Trail Breaker event.

Unlock Hitman
Earn any medal in the Tommygunner event.

Unlock Rampart
Earn any medal in the Raging Bull event.

Unlock Dominator series 20pts
Survived every event in this series.

Unlock Five in a Row 15pts
Killed five Opponents in rapid succession.