hi all, may i ask some question for preve? anyone of preve owner got install blow off valve? because my preve already install a HKS SSQV2(adjustable) but only got little sound only, someone know is what problem ? sometime when i use the semi-auto gear racing, then shifting gear sometime got sound(but little sound only) sometime no any sound. is that our preve vacuum no enough strong? no enough to push the blow off valve? got any idea can modify that vacuum output more powerfull?or at where can found more powerfull vacuum in enjin? thank a lot^^