Stock the car comes with a BPV, not a BOV. Big difference between the two.
Stock BPV does not vent to atmosphere, it gets 'recirculated' back into the intake so you won't hear anything. Aftermarket BOVs vent to atmosphere which is the noise you hear when you let off the throttle.
But even when I first bought my car I could hear some noise of the turbo spooling, and now I feel like I put it back on and I cant hear anything, I just hope I'm not damaging my turbo, I'm still holding boost pressure and the car runs exactly like before.