Because I want the rear. 5-1" higher than the front. We'll see when the OME springs get here, but I'm betting that my rear will be about 1/2" lower than my front which means ill need to make up for 1-1.5" of height to get it to sit were I want. Note that I'm among the minority.... I don't like it when they sit perfectly level and it absolutely hate when it looks like the rear is sagging.