If your talking about a mod chip, then no it won't, just make sure to get a chip that will let you turn it off so that when you go on xbox live, microsoft doesn't ban your account
Modding Halo 2 will no mess up your Xbox so don’t worry about it…mod chips are the same as soft mods you can go on live with a soft modded Xbox but if you mod your maps you will get banned we will help you with fun mods but if your ganna cheat we cant help you….