Yeah I watched the video. It’s normal as shown in this nice graphic from Unitronic
Beep, whistle, howl whatever you want to call it. If you do not have the latest rev DV you can try that. I never got any resonance with my GFB DV+ with the stock turbo bit some people do.
Did you use the spring with the DV+. Maybe try removing it.
Thankfully my full length IE/BSH Frankenstein intake doesnt make the beep/whistle/howl with a stock DV or a GFB DV+ but I was wondering for those who have a pesky one that wont go away I wonder if slightly adjusting your intake tubing is enough. Like maybe loosening the turbo inlet coupler and pulling out the intake like 1 or 2 cm or slightly rotating the tubing is enough to change the harmonics of the piping where you don't get the sound anymore. Idk just a thought.