Yes, the HKS are SWEET. I had two on my TT300ZX, and let me tell ya`, running 18psi of boost with a pair of HKS GT2835 turbos those buggers would scare the bejeezus out of those poor college kids in their convertable jeeps
BOV`s don`t make any horsepower at all and they`re not supposed to. They`re even pretty pointless on an automatic equipped vehicle as they are designed to relieve boost pressure when the throttle plate slams shut during shifts. They`re a lot of fun as a tool to play with people, but beware of teenage wieners in honda civics wanting to race you when they hear it...