How do you get cheats for nfs prostreet Xbox 360 on Xbox 360?

get nfs 4 the ps3 graphics r better an u can get cheats 4 it

nvm wat he just said all you gotta do is find the cheat you want go into career go into code entry enter secret code and type it in. But if you got the update it gets harder in order to make cheats work you need to practicality wipe your harddrive of nfs prostreet :(