the cheapest way to add a decent amount of power it to go with ol' faithfull, nitrous oxide.... its definitely not the best way to add power but like drinking, is alright in moderation... the factory"stock" engine will not be able to handle prolonged use and definitely not be able to handle big sprays... but if you wanna go this route, be warned, and follow the instructions and recommended spray nozzles, look to spend around $400-$600 or maybe less, especially if you can find a used kit... good luck p.s. "kick ass" is a little bland, so i assumed you meant power wise, but if you meant look and over all total package... that's a different ball game