front must be springs cause everything else look stock.
Unless it would be spindle(which I doubt since it's the more pricey option and need to run 20" or more wheel)
rear: is 5" drop: flip kit and lifting shackle = 5"
to be 4" you need a front lifting brakcet as well which you don't
But you have the helper bag, and when filled with 30-50psi you gain ~1".