He’s talking about the turbo silencers. They basically look like little fans in each of the inlet pipes from your air intake and they pull right out. That gives you more of the whine/air noise. That coupled with a larger aftermarket intake will achieve what you’re looking for.
Once you vent to atmosphere with your BOV if you want to enhance that sound a Boomba adapter will do the trick. I have one on my setup which is the largest of the AFE intakes, removed turbo silencers, SVC IC, Boomba adapter w/ factory BOV, and the sport 93 Cobb tune.