Well, with the supercharger, turbulence is not going to be a big issue, though I see what you are saying. But even if the air flow was perfectly straight, when it hit that blower a whole bunch of turbulence would be added, to say nothing of the effect of the Lower Intake Manifold.
That said, I think its an interesting set up, I just think that he might be better off with a larger filter and overall tube diameter and less bends.