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Can you believe it?
Yes, if you want to get banned permanently from the forums for talking about using mods in matchmaking and banned from matchmaking for using mods.[Edited on 03.12.2009 1:17 PM PDT]
Matchmaking mods are for -blam!-s, custom mods are fun.
if you are using mods in Matchmaking on Halo 2, it will boot you from the game in about 19 seconds but you will never be banned from matchmaking though