[DanEC]

I wonder if any of the track guys have experimented with under hood and wheel well pressures to see how much good the louvers will do. The under hood area is a high pressure zone so the wheel well area would almost have to be an even higher pressure zone in order to get much air exchange through them into the under hood area. Is the wheel well area high pressure at speed?

There may be a slight Bernoulli's effect created by the air flow out of the fender louvers - pulling some air in from the wheel wells.

Or is the idea that heat will flow out of the under hood area, through the vents into the wheel wells?

I don't know - just wonder?