As for the LG's.....if you get Specialty Z to do them, you shouldn't have any problems. Kyle at IPP also told me a while back that he has had several Leader Gear Diffs built locally with no whining issues. Search "leader gears" on this site, any you may change your mind about not getting them. They make the car feel much lighter and responsive, and they put you in the "power band" quicker. IMO they're money well spent.