The Nemesis Diffs and Front Drive Shaft are common(And Needed IMO) upgrades. The GST is essentially the same as the Genesis LE with a Nemesis tranny case for the MTM breaks. The Center diff is in fact the Genesis Diff with spacers to fit in the nemesis case, so you will have the same problems in the drivetrain(tho not many) as the Genesis LE. I have a list of part #'s of what it would take to convert to the Steel front drive shaft if you need them(I'm at work so it will be this evening when I can post them)