Suction from petrol V8 air intakes?

[Hereward]

I was changing the air filters on my Touareg and was surprised that there was no discernable suction when I held my hand over the air inlet pipe (between the filter box outlet and the engine intake), with the engine running at idle.

I was expecting a mild vacuum-cleaner effect, should there be?

The engine has two air inlets, one for each bank of the V8 (petrol). Performance does not feel impaired on the road.

[SuperchargedVR6]

The throttle is closed, so air volume drawn in is quite small and might not be 'felt' on the end of a 3" bore intake pipe?

Crack the throttle wide open though and it might try and pull your arm in