UPDATE & FIX – After calling BSH, they told me there is another check valve inside the metal breather hose which connects to the crank case. This is a redund…
Audi A4 B7 BSH PCV Replacement & New Noise
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That is the rear check valve for the pcv system. It doesn’t do any harm
just makes that pop corn popping sound. If you would like to get rid of
that you will need to disconnect the rear breather, that metal hose next to
your turbo inlet. On the side that connects to your valve cover you will
see a little valve “looks like a fan” you can pop out the center of it make
sure you get all the pieces out. If you need more information search “mkv
gti rear check valve removal”.
nice heat shield