So I'm getting ready to pull the trigger on a 2.5" lift. Nothing fancy like a Rock Krawler, but thinking a Rubicon Express, since they fit my budget. Anyway, I see so much about having to use aftermarket wheels with greater than 4.5" backspacing...this is what's confusing me. I'm not planning on buying new wheels at this point. So does this mean I can't use my factory wheels with a lift? Why does a lift change backspacing requirements? Also, will I need an exhaust spacer for my 2013 2 Door? It seems some kits require it and some don't. Any and all help is appreciated!