23 turbo weight goes up what i would say significantly, first, all that exrta cast iron 75# give or take, intercooler piping and intercooler (non stock and on front) (40#) and where the extra weight is makes a difference. as for rear ends, i love welded diffs, but i like to get squirely, but for a daily, ls/posi/locker all the way, so you dont anoy those pesky law enforcers