How much psi can the stock BPV hold?

I am not sure what they leak at but a friend of mine that has a VW always taked about VW's bad DV's and how they replaced them with forge unit's. There are a couple other popular brands that sell aftermarket DV's you just have to do a search.
 
i assume you're talking about the msp bpv. kwiktsi took the boost up to 21 psi!! car still works fine. many owners are running 10-12 psi.
 
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