If you dig, you will find it. He stated that currently while following another car, you lose downforce, and increase drag... I believe that Ogami has called this the overtaking oxymoron. By having a lifting wing (very near neutral) in the center of the wing when this effect happens, it actually causes the front wing to increase downforce while decreasing drag, which is what you want for slip streaming.
Ogami can fix anything that isnt right. I still ahve not found in the tech regs the specific banning of the thru-nose hole, so if anyone can direct me, please do so!
In the mean time, more pics!