Super Speed
Before everything you must have the Junkman performence parts.The way to unlock it is at the start menu enter.
UP,Down,Up,down,Left,Right,Left,Right and go to challenge series.Go all the way down and go to the "BugerKing challenge"and pass it.
After your done go to my cars and pick a car, pimp it out and on performence,press X and then press B and accept.
Then enter performence again and pick the Junkman parts on everything and press B.Accept and test it out.
More tricks, tips and cheats for this game are right here - Need for Speed: Most Wanted cheats
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