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I think the "Heat Extractor" hood would be better as far as performance goes , but how much could it help ? I think the hood choice is more for looks than anything.....
I bought the hood from Here , they had the cheapest price at the time I bought it (I called all the companies that advertise in Truckin' magazine and everyone else was $100 more).
FYI, the hood got shipped directly from Keystone by truck and they would only deliver it to a business address.
I bought it mainly for looks and that the vents in it are functional and are supposed to help remove hot air from the engine bay.......I have no proof that it does or doesn't do this.
Well it must help, did not know it had active vents.
From a thermodynamics point of view if you heat air it expands, all the air that enters these monsters is heated, one only needs to open his hood and figure out that the heated air gets trapped, just not enough ways for it to escape.