There are two such BOVs on my car and one of them has a small tear in the diaphragm. I could hear air under the hood when I turned on the boost. I also only gain 9 or 10 pounds when I normally gain 18-20. That makes a big difference. BTW my BOVs are open to atmosphere so you might not notice a leak if yours is still closed on the intake side. I think factory is around £14 for OE.
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