the one from BG is jsut a flash, you send in your pcm overnight, they flash it and overnight it back to you, quick easy install. but you only get one tune
now if you want three or more tunes to be able to change from tune to tune go with the sct.
the sct enables you to change the tune anytime you want, you can jsut get tunes emailed to you from the source , and anytime you make a new change such as headers or so on, you can jsut download a new tune
if the sct is the one you want I highly suggest you emial torrie, tell him stinker sent ya
he does most of the sct tunes for everyone, his email(best way to get him) is
[email protected]