VFRBulldawg

I believe that the vtec does give a 6th gen more low end grunt. Two valves per cylinder usually gives you more low rpm torque but chokes the engine at high rpm. Its really late where I am but I recall it has something to do with keeping back pressure or static pressure high enough through the exhaust system which is why you don't want to just open an exhaust wide open without making other changes to the engine because it decreases low rpm torque. I'm sure one of our engine experts will be along to explain further or correct me soon. If vtec cuts low rpm torque then why would honda put it on the bike? That's kinda dumb.

I agree, it is there to help with flow under the windscreen and to help reduce turbulence behind the screen. In all likelihood, without it you would get a low pressure vortex up under there. I had a long day at work and my engineering brain is shot at the moment. I'll be having some beers with some old college buddies who did aerospace engineering with me later tonight. Perhaps we can hash this out and come up with only a mildly beer influenced psuedo scientific answer.

It's early, but I'll take a SWAG at this. As an aerospace engineer I just can't help myself. First, your description of laminar flow over and airfoil is a little backwards. When talking about a typical wing shaped airfoil the the curvature makes the upper surface longer than the lower surface. This requires the airflow over the upper section to have to increase velocity relative the airflow over the lower section to move the same linear distance from leading edge to trailing edge. Fluid mechanics tells us that when air flow increases velocity while holding temperature constant that the air pressure drops. I know this can sound counter intuitive to some people, but higher airflow velocity means lower air pressure, but don't confuse air pressure with drag forces caused by airflow moving around an object. Drag force is primarily a function of the airflow velocity squared, not air pressure. I don't think your laminar airfoil flow model really applies well, here. There is a very small opening at the front of the windscreen letting in a small amount of airflow under the windscreen relative to the amount of airflows over it. I can't say for 100% sure, but I feel pretty confident that the area under the windscreen is a low pressure pocket, and not a high pressure pocket, relative to the air pressure moving over the windscreen. That small amount of airflow from the inlet spreads out to cover a greater volume as it moves back. Well, I have to run at the moment. I'll try to come back later.