This noise happens all the time if you have not tighten down properly at every intake joining section. It usually happenes at the seal where it joins near the turbo (back of the engine bay). Make sure every clip is secure and really tight. If you still have the banjo clip in that location i would swap it out for a jubilee clip as you can tighten them up much tighter and stop that tiny bit of air causing the whistle.
I have had pretty much intake, and the only that would never stop doing it is the EVOMS intake. Saying that i have not tried the Volands.
All intakes have different pipe diameter and degrees of bend, so some intake will suffer from great velocity (sometime causing that annoying whistle)
Good luck fixing it mate.