I've had them melt down before on stock tune, i always figure that GM designed the cats to operate under their lean tune to last the 100K warrantee on this emmissions part. i would remove it so, at a later date one can reinstall it and it will perform to spec, by not getting cooked with excessive fuel.. its just a thought I had, i doubt anyone will do it , unless they want a higher flowing exhaust
better yet take down the factory exhaust dont cut it up, and buy the offroad system and add your own mufflers