Im Thinking about a custom Supercharger mounted ontop of my engine in place of the upper intake, Now I remember with my intake swap there was vaccum lines connected to the upper intake... what do I do with those to get vaccum?? thanks for the time!
The pressure regulator hose is at ~15 psi just sitting there (standard atmospheric pressure), so boost means 15psi + whatever boost you get, whereas vacuum is 15psi - whatever vacuum you are drawing.
Scott