When you get a jtag you use XexMenu to rip the ISO files from the game. Then switch some of the files (Code post, Xex's, patch, Title update) with modded one's. I'm assuming your talking about Mw2 since this has been posted in the Mw2 modding support. Don't think about hosting online lobbies. Its patched! If your buying a jtag just for lobbies i'm warning you now it will get boring, fast, dont buy a jtag for that reason. Thats not what they were made for.WOuld i need to find a modded iso or can i just download it?