DerpingTurtle wrote Can I host WaW lobbies though? Sorry I sound like a noob but I am. Also do I need to download the mods?

At most you can have gamesave mod menus. Those mods will only effect you though. If you want to host actual WaW lobbies then you need a flashed xbox.

And you can download the mods if you want. People release premodded gamesaves all the time that you're free to download and use.

Now just one more thing, do you know anyone who can host me a Challenge Lobby for MW2?

no, no no and no, maybe, no, ask in the hosting section not here.

Try to Google it there's tons of answers you can find. Stop being lazy and go look.

DerpingTurtle wrote So can I host MW2 Challenge lobbies for me and my friend. Can someone go a little more in depth into it.

Modio is a device explore / .GPD/.SVG editor. No you cannot host Challenge lobbies with it, or host any online lobbies with it for that matter (except for infections that carry over to Spec Ops and some Zombie mods on WaW) No it's not a virus, So if you're thinking of downloading it you'll be fine. You can use Modio in the following ways:

Mod campaign
Explore a USB/Hard Drive
Edit .svg files
Edit .gpd files
Save rehash and resign
Download free gamer pictures
Make custom xbox360 themes
And more

No it's not a virus, it's for modding games. For e.g. you can mod your player on FIFA 11/12 to the highest level it can be