Quote Originally Posted by wraith666 View Post
Different cars but I have often found changing the intake to a higher flowing one makes the diverter valve much more noticeable. Not BOV noticeable but close enough.

There are different valves out there that can do different amounts of recirc or vent to atmo so as not to upset the MAF.
No venting to atmosphere for Polo's. Mine is recirculating and there's lots of wooshing, plenty of Brissy guys will tell you.

Even with an enclosed cone filter it did it.

A new VW one ending 710P is plenty good enough for up to stage 2.