I'm just not a believer in this " lift tearing boots" theory. i worked as a undercar mechanic not to long ago, and I've changed a lot of boots and CV shafts. from what Ive learned is most split boots are from chemicals ( engine degreaser, carb cleaners, ect.) they get dried out and split. and there are a lot of different boot materials and each one has a weakness. CV boots are made to flex all the time, if lifting was causing failures then every time you turned a corner you would be killing your boots. I lifted mine 2.5" a few months ago, my boots were in perfect shape, I've been checking them ever month to see if they are cracking, so far no change.