Webers typically will loose around 80 hp with air cleaners on them. I don't know about FI TB's? I would presume they are similar?
The sugar scoop is what you want over the stacks. You do not need a ram air effect on a Pantera, just access to enough volume of air which you already have.
The window scoops are also in a dead air area. The air stream is actually along the roof of the car and the "bat ear" shape is because the edge of the scoop needs to reach up into that air stream.
As it turns out, this type of a velocity stack does not like being in a turbulent air flow location. They like drawing in gentle air, like the drain in a sink or a bathtub.
Drawing air flow from beneath the car works into the concept but it is not quite a vacuum cleaner effect in the this car.
There is an airscoop made for a Pantera which draws air from the top of the windshield and ducts it across the roof and directs it down into the window area.
It is a modification of a scoop built for the Poniac Fiero but the sugar scoop from the L's does the same thing.
Putting a 90 degree trailing edge on the roof spoiler is just going to add lift to the rear like full flaps do on an airplane. I don't think that you want to do that?
Look at this scoop. It is a modification of the Fiero thought.
http://pantera.infopop.cc/eve/...5562/m/4561096316/p1
This is Mad Dogs Pantera. It has the Bat Ear scoops on it. Notice how the corners stick up?
You need to watch this car in action. Then there will be no question why they call Denis "Mad Dog". It is very self explanatory?
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