These are all the codes I use for Mw3 and they all work so enjoy!

SM8E52

Call Of Duty

Player Magnet V2 [PoptartHunter/HexWire.x10.mx]
2820236A 00008000
80000000 808A1C1C
8A000C0F 008A499C
8A000C0F 008A771C
8A000C0F 008AA49C
8A000C0F 008AD21C
8A000C0F 008AFF9C
8A000C0F 008B2D1C
8A000C0F 008B5A9C
8A000C0F 008B881C
8A000C0F 008BB59C
E0000000 80008000

Increased Bullet Damage Non-Host [PoptartHunter]
2820236A 00008000
F6000002 8000817F
62756C6C 6574696D
70616374 00000000
14000044 4B18967F
E2100000 00000000

Rapid Knife [PoptartHunter]
20796920 01000000
F6000001 808E8180
00044F6E 00044FB0 
14000274 00000000
E0000000 80008000

Rapid Knife [PoptartHunter]
04E88348 00000000 

HOST_IP# Command [HAXZing TERR0RIST]
201D2644 FFFFFFFA
F6000001 8000817F
00000000 81132A54
5A010000 00000164
90010000 00000000
58010000 00000000
30000000 484F5354
30000004 5F495023
4A001000 00000000
14000000 80181E88
E0000000 80008000

name=**/ Check If Host Command [HAXZing TERR0RIST]
201D2644 FFFFFFFA
F6000001 8000817F
0000000A 81136AE0
5A010000 00000054
90010001 00000000
F6000001 8000817F
00000000 81132A54
5A010000 00000164
90010002 00000000
58010000 00000000
30000000 6E616D65
30000004 3D2A2A2F
4A001002 00000000
9A00041F 00000000
E0000000 80008000

Aim Bot (CCP) [PoptartHunter/Goober]
202023C8 00000004
80000000 808A499C
8A000C0F 008A1C1C
80000001 808A771C
8A000C0F 008A499C
80000002 808AA49C
8A000C0F 008A771C
80000003 808AD21C
8A000C0F 008AA49C
80000004 808AFF9C
8A000C0F 008AD21C
80000005 808B2D1C
8A000C0F 008AFF9C
80000006 808B5A9C
8A000C0F 008B2D1C
80000007 808B881C
8A000C0F 008B5A9C
80000008 808BB59C
8A000C0F 008B881C
80000009 808BE31C
8A000C0F 008BB59C
E0000000 80008000

Knife Bot (CCP) [Goober/PoptartHunter]
202023C8 00000008
80000000 808A499C
8A000C0F 008A1C1C
80000001 808A771C
8A000C0F 008A499C
80000002 808AA49C
8A000C0F 008A771C
80000003 808AD21C
8A000C0F 008AA49C
80000004 808AFF9C
8A000C0F 008AD21C
80000005 808B2D1C
8A000C0F 008AFF9C
80000006 808B5A9C
8A000C0F 008B2D1C
80000007 808B881C
8A000C0F 008B5A9C
80000008 808BB59C
8A000C0F 008B881C
80000009 808BE31C
8A000C0F 008BB59C
E0000000 80008000

TELEPORT ALL PLAYERS TO SECRET ROOM SEATOWN[PoptartHunter/Goober]
2820236A 0000xxxx
068A1C1C 0000000C
C4EE8FA6 44656B96
C1E6ABB5 00000000
068A499C 0000000C
C4EE8FA6 44656B96
C1E6ABB5 00000000
068A771C 0000000C
C4EE8FA6 44656B96
C1E6ABB5 00000000
068AA49C 0000000C
C4EE8FA6 44656B96
C1E6ABB5 00000000
068AA49C 0000000C
C4EE8FA6 44656B96
C1E6ABB5 00000000
068AD21C 0000000C
C4EE8FA6 44656B96
C1E6ABB5 00000000
068AFF9C 0000000C
C4EE8FA6 44656B96
C1E6ABB5 00000000
068B2D1C 0000000C
C4EE8FA6 44656B96
C1E6ABB5 00000000
068B5A9C 0000000C
C4EE8FA6 44656B96
C1E6ABB5 00000000
068B881C 0000000C
C4EE8FA6 44656B96
C1E6ABB5 00000000
E0000000 80008000

TELEPORT ALL PLAYERS TO SECRET ROOM SEATOWN (shorter version) 
[Goober/PoptartHunter] 
2820236A 0000XXXX
088A1C1C C4EE8FA6
20092D80 00000000
088A1C20 44656B96
20092D80 00000000
088A1C24 C1E6ABB5
20092D80 00000000
E0000000 80008000

Infinite UAV [PoptartHunter]
051426B4 01000000

Red Box + Highlight Enemies [Mitch/Bully@Wiiplaza]
201D2644 FFFFFFFA
20BC1050 00001000
04BC1050 00001018

No UAV Jam *NON-HOST* [Bully@Wiiplaza]
201D2644 FFFFFFFA
04F8718C 00000000
04EBD8FC 00000000
04E8AAFC 00000000
E0000000 80008000
E0000000 80008000

No Recoil *NON-HOST* [Bully@Wiiplaza]
201D2644 FFFFFFFA
04BC3924 00000000
04BC3928 00000000
04BC392C 00000000
E0000000 80008000 

No Flash Effect *NON-HOST* [Clay10/Bully@Wiiplaza]
201D2644 FFFFFFFA
04EFC6EC 00000000
E0000000 80008000

Early Start *Host Only* [Bully@Wiiplaza]
201D2644 FFFFFFFA
208A4660 00000004
048A4660 00000000
E0000000 80008000

Impact Multiplier [Bully@Wiiplaza]
201D2644 FFFFFFFA
05144188 4479C000
E0000000 80008000

FORCE HOST [[THC]2HIGH]
2820236A 00008000
201D2644 FFFFFFFA
0513934B 00000001
E0000000 80008000

EMP ALL PLAYERS [GOOBER]
2820236A 00008000
F6000001 808A808B
815FD7C0 814BD7C0
5A010000 00000040
18000000 00000100
20092D80 00000000
CC000000 00000000
201D2644 FFFFFFFA
F6000001 808A808B
815FD7C0 814BD7C0
5A010000 00000040
18000000 00000500
20092D80 00000000
E0000000 80008000

Talk with Enemies[BreaK]
05133C28 01000000

Talk with Alive [BreaK]
0513E6F4 01000000

Talk with other Death People [BreaK]
0513E7C0 01000000

Level 80 [Seth@WiiPlaza]
201D2644 FFFFFFFA
42000000 92000000
053D9E5C 18A51A00
E0000000 80008000

10th Prestige [Bully@Wiiplaza]
201D2644 FFFFFFFA
42000000 92000000
053DA06C 0A000000
E0000000 80008000

Infinite Prestige Tokens [Bully@Wiiplaza]
201D2644 FFFFFFFA
42000000 92000000
053DBEC8 0000270F
E0000000 80008000

All Weapons Lv.31 [Bully@Wiiplaza]
201D2644 FFFFFFFA
42000000 92000000
093D9E64 2710FF01
20450004 00000000
093DA000 1E1E1E1E
20100004 00000000
E0000000 80008000

All Titles & Emblems [Bully@Wiiplaza]
201D2644 FFFFFFFA
08838EF0 FFFFFFFF
202F0004 00000000
E0000000 80008000

All Pro Perks [Bully@Wiiplaza]
201D2644 FFFFFFFA
42000000 92000000
093DADF4 09090909
20060004 00000000
E0000000 80008000

Everything Purchased [Bully@Wiiplaza]
201D2644 FFFFFFFA
42000000 92000000
093DAF04 00000100
20030004 00000000
093DAF14 00000200
20460004 00000000
E0000000 80008000

All Challenges Completed [Bully@Wiiplaza]
201D2644 FFFFFFFA
42000000 92000000
093DABE8 09090909
20C00004 00000000
E0000000 80008000

All Accolades Completed [Bully@Wiiplaza]
201D2644 FFFFFFFA
42000000 92000000
093D93D0 FF000000
206B0004 00000000
E0000000 80008000

Infinite Unlocks [Bully@Wiiplaza]
201D2644 FFFFFFFA
0494C45C 0000270F
E0000000 80008000

Have 15 Custom Classes [Bully@Wiiplaza]
201D2644 FFFFFFFA
42000000 92000000
053DBED0 0000000A
E0000000 80008000

Support Streak Pwnage [Bully@Wiiplaza]
201D2644 FFFFFFFA
42000000 92000000
073DA914 00000014
00005E35 53757070
6F727420 5E345077
6E616765 00000000
013DA910 0000005F
013DA933 000000XX
013DA935 000000XX
013DA937 000000XX
E0000000 80008000
*This code allows you to run any streaks on the support streak package*
*X Values*

01 = UAV
02 = Care Package
03 = Predator Missile (don´t use)
04 = I.M.S.
05 = Sentry Gun Airdrop
06 = Sentry Gun
07 = Precision Airstrike
08 = Cobra Attack Helicopter
09 = Strafe Run
0A = AH6-Overwatch
0B = Reaper (don´t use)
0C = Assault Drone Aidrop
0D = Assault Drone
0E = Pave Low
0F = AC-130 (don´t use)
10 = Juggernaut Assault
12 = Osprey Gunner (don´t use)

14 = Counter UAV
15 = Ballistic Vests
16 = Airdrop Trap
17 = SAM Turret
18 = Recon Drone
19 = Advanced UAV
1A = Remote Sentry
1B = Stealth Bomber
1C = EMP
1D = Juggernaut Recon
1F = Escort Airdrop
20 = M.O.A.B. (comes out as Assault Drone)

30 = Exteme Conditing Pro
31 = Sleight of Hand Pro
32 = Scavenger Pro
33 = Blind Eye Pro
34 = Recon Pro
35 = Hardline Pro
36 = Assasin Pro
37 = Quickdraw Pro
39 = Blast Shield Pro
3A = Sitrep Pro
3B = Marksman Pro
3C = Steady Aim Pro
3D = Dead Silence Pro
3E = Stalker Pro

Drop Zone:
060000A0 00000008
67726E64 00000000

One in the Chamber:
060000A0 00000008
6F696300 00000000

One Flag CTF:
060000A0 00000008
6F6E6566 6C616700

Gun Game:
060000A0 00000008
67756E00 00000000

Juggernaut:
060000A0 00000008
6A756767 00000000

Team Juggernaut:
060000A0 00000008
746A7567 67000000

Infected:
060000A0 00000008
696E6665 63740000

Arena: (Unreleased Gametype on Xbox360, PS3, PC, Wii)
060000A0 00000008
6172656E 61000000