Yea same here, Ive since been told its the noise the K03 makes when spooling? don't know how correct that is but apparently the increase in airflow has this effect on it.
Ive got quite used to the sound now and tbh its not that bad but when I floor it the car sounds like some silly jap toy, I doubt its the DV I only changed mine 3weeks ago to a revision D.
Although when I let off, the pressure release does sound like a dump valve -.-