You seem to be looking for confirmation that the white plastic venturi tube and the airbox design is indeed a Helmholtz Resonator. It's engineered to absorb air resonance and reduce sound levels.
The white tube creates a low pressure venturi effect, similar to the function of a carburetor throat.
http://www.phys.unsw.edu.au/~jw/Helmholtz.html
http://www.audioholics.com/techtips/...orabsorber.php