Six pipe? What do you mean?
I meant take off your air filter, and make a cap that will cap the intake pipe where the air filter bolted on, if possible. I'd have to know the layout of your intake piping, I guess. More details?
The BOV should be shut with no vacuum to pull it open, if its open at 100kpa (0 psi of boost) then you're venting boost, ie, boost leak. You'd need to adjust the BOV to be closed at 0 PSI.