[aerohead]

[QUOTE=fearlessjoe;494724]thats proably a stupid title .....

this is my first real post on here... so hi

has anyone ever thought about .... i dont know how to describe it..... making air vents that run from a sunroof and or side window to out the back window or some kind of make shift 'vent hole'

so if you didnt have anyone in the back you could channel air to behind the car


allow my bad 2d ms paint job to ellaborate

The problem is that the air behind the car is at a higher pressure than at the windshield header/A-pillars.
If you open the vent,air will move forwards towards the low-pressure area,defeating it's purpose.
Also,any air robbed from the outside of the car's body (going through the vent duct),destroys the the boundary layer where it might have flowed,so you have even worse flow separation and higher drag than if you did nothing.