Really! It's fucking annoying huh. Does it on idle and on boost for me.
I ordered a new gasket today too so will fit it and see what happens, as the corner of my current one ripped off when I changed it the other day off the old manifold.
Urm, boost is pretty sloppy tbh, comes in a lot later than it did when it was running good with the oem manifold. It does boost, just a bit later :s.
Yeah good to mention I don't think it's to do with the manifold itself haha, just coincidence and due to moving stuff about I guess!