Im not really exprerienced with the different types of chargers, i heard of the vortech and rotrex, didnt know the differences, upgradability.. Im not looking for mad amounts of hp, personally id be content in the 350 -400 range. atleast i say that till i get it, then i'll want more. but currently i have no mods on the car and im trying to make the best choices without fubarring my car. what charger does the ess system use? yay's or nay's on that kit?