Sounds like compressor stall, basically you're boosting a lot and you let off the power and there's nowhere for the air to go. Have you upped the boost a lot? Does it on my car but I run 1.8 bar of boost.
Like this noise? https://www.youtube.com/watch?v=_61PN7Y_w1g
Like this noise? https://www.youtube.com/watch?v=_61PN7Y_w1g