Ha, you thought this was some incredible cheat didnt you.
Well, tough, its not.
Instead, keep an eye on Xbox live in Halo3 for Bungie's Double XP weekend. There you can find games designed to bump your XP to super levels, mind you that you actually have to win first.
Fun game types like Grifball, Team Swat, and Team snipers will be played on a regular basis.
GO NOW, IT STARTS TONIGHT!