i think you can just drive it as is. i dont think that bypass valve is necessery if you just ride the car normally like not gunning the thing off the lights all the time and reving mostly 5and 6 k,well it should not suck in any water.But it wouldnt hurt to have one put in its problly inexpensive just look it up as other have posted and i would keep that cai, probly cheaper to have a valve installed than putting the stock setup