It seems that my car has developed a noise that Les Interenate describes as the Clutch Delay Valve.

One described it best as the sound of "a muted goose"

Since this car is essentially a Subaru (even though the tranny is out a lexus? Or is that the diff) anyway I figure maybe some of you have this on the modern cars.

It seems to only happen when the clutch engages too fast or too slow (if I drag it) and only at high RPMS/load.

Something to worry about? I'm at 5000km and it hasn't been doing this previously.