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My understanding of a Blow off valve is that when the throttle butterfly slams closed and the pressurized air goes racing back up the intake tract toward the turbo impellars which if the air makes it there will shock the turbos and slow down the impellar speed causing more time for the turbos to spin up their previous speed.
The "Blow Off" releases this pressure and does not slow down the turbos RPM. I also agree that the rubber diaphram that is used in the DV will likely fail on cars that have a "box" installed, 15 PSI will kill the rubber and a higher grade unit, be it DV or BOV will be needed. Hello all by the way!
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