Hiker--talk about clean and simple, wow! What is the output?

Harry, the HKS BOV and the hardpipe section was free so I threw it on there. That particular section of intercooler pipe that it replaced is a necked-down plastic piece and is restrictive.

The Bosch valve recirculates air at lower boost levels (below about 7 psi) and then the HKS starts working. I did hollow-out the HKS so it doesn't whistle; it simply makes an air release sound. I have never had a stalling problem using both valves--I could feel a slight drop in power after shifting with just the HKS and I would blow the Bosch one if I ran it by itself.