They previous owner of my car put a BOV on my car (S70 T5M). It is a no name looking BOV with HKS vacuum t's so I am hoping it's a HKS, but most likely its a knockoff. <p>It was working great, whistling like it should the other day, I took it apart to replace the fin in the middle since it was broken, now the diaphram does not move when throttled and it doesn't make the whistle noise anymore.<p>I have taken apart numerous times, put it back together, correctly! and still no dice. <br>The paper gasket in the flange was old and crusty, could this be the culprit?