u/FormalAlternative534

Hello! So the other day I did a pull, and TC kicked in and heard a loud loud bang. Then I continued driving as normal, and the RPM's started bouncing when off throttle/idle. rough idle ( like air leak symptoms), and a whistling sound around PCV-Intake manifold-HPFP. So went ahead and installed my catch can with Africa plate to see if it was a bad PCV, but nothing changed. So I started checking to see where the noise was coming from and found out that if I move the (not sure about the name) circle next to the intake manifold, the sound will go away. So I guess the air leak is coming from there.

Any ideas of what I could do to try to fix it? or if its even that. Do I need a new manifold?

Thanks

MK6 GTI, FBO, stock intake m