I tried it, and I just got the whoop from the halltech, but I do recall before replacing my stock airbox this noise.
Have a friend stand in front of the car and listen near the airbox (don't run over said friend) and juice it slightly in neutral. I think the sound is the first gasp of air coming through those tiny holes in the airbox.
As a test, you could try removing the bottom of the airbox and repeating the test. Or just do what most of us do, replace the stock airbox... /phpBB/images/smiles/icon_smile.gif More power /phpBB/images/smiles/icon_smile.gif
JC