Yes. Krayzie 1.1.1
is the best one to go for - among its many benefits it is protected against game updates destroying the softmod!! You'll need an exploitable game - Splinter Cell (original game, all versions), 007 Agent Under Fire (original version only) or Mechassault (original version only), and a method for getting the gamesave onto the Xbox. The easiest way is to use a usb adapter like this one
, and a usb stick (not all work, but lots do, and someone you know will have one that will work!), plus Xplorer360 (beta 6) to transfer the saves. You can also transfer the gamesave to an Xbox memory card using an already modded Xbox, or with an Action Replay adapter.
Or you can hotswap
with Kingroach NDURE 3.1