Since my air box was out, I decided to add 2 more vents. I had the two on top already and but then added two in the underside. With the top two only, I have never heard the whoosh noise.
I took a quick drive and did WOT. I have never heard the whoosh blow off valve noise till now. Roc Euro is like a 10/10 whoosh noise. The whoosh noise is like a 4/10 compared to roc euro. I hear the turbo whine more in city driving and only hear the whoosh in WOT. The stock airbox does have K&N filter.
Try it out if you want more noise!
Original top two:

Added two:

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