on my 1.8T sport (2000 model) i have noticed there is a out pipe that seems to have nothing on it.
I would think it should have a hose connected to it or at least a blank on it.
If you were looking down at the airbox and removed the short piece of black plastic air tube that connects to the top of the box and also to the air scoop located in the front cross member and looked down in the gap you can see it.
will try and get a pic in a min to explain a little further. Just seems odd to have this where unmetered warm air can be sucked in.