my friend has an hks bov and it has two nipples. and on the hks site it says that one is for the regular bov, and the other can be used as a pop off valve. and it says to hook it up to a non vacuum boost source. just to be sure can some one explain to me how that works. and what a pop off valve is. also where is a good place to find a non vacuum boost source? tia

 

hook it up to ur turbo i think. someone told me to do that to the greddy one. u know how greddy has two nipples to. but i dunno ill try it soon. no hoses. lol

 

Pop off valves are used for protecting an engine from overboosting (greddy makes one) or by sanctioning bodies to limit the manifold pressure of turbocharged F1 cars etc which will limit power