Originally Posted by ravill
Question good folks:
When equipped with a Blow Off Valve (BOV) with a supercharger (A and A e.g.), when the supercharger is NOT making enough pressure to overcome the vacuum in the manifold, does the BOV suck air IN to the intake manifold?
It will never suck air in, there's no need for a filter (if that's where you're going). Filters do minimize the sound of the BOV though.