No. Xbox does not support modifications to games.
There are no cheat codes for MW3 on live. What you are asking for are hacks and mods which are illegal and result in being banned and profile whipped clean of gamer score.
There arn't any.
No -_-
Xbox
There are around twenty cheat codes for the Call of Duty MW3 game for the Xbox. Some of the cheat codes are the secret killstreak, gold camo, and easy XP.
No there is a Call of Duty reflex edition that was released when the MW2 was released for the PS3 PC and Xbox 360 and a MW3 that was released with MW3 for the other platforms
mw3 is part of mw3, it's call of duty mw3
The Call of duty mw3 game (saved games etc) are located in the memory settings.
Don't buy it buy battlefield 3 instead
call of duty MW3 is already out, it was out November 8, 2011
You can get your mods working on MW3 by uninstalling and reinstalling the game.
MW3