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Likely good for peak HP, but when FE driving you target the minimum power needed to drive your route. That means lower manifold pressure, obtained via whatever combination of partly closed throttle valve and upstream restriction gets you to that needed manifold pressure.
Reducing upstream restrictions just means you'll hold the throttle closed more, and increasing upstream restrictions means you'll hold the throttle open a bit more. The end result is the same.
Back in my max. HP days I played with that sort of ram air, but just like the equations say, there's pitifully little pressure available from forward speed until you exceed about 90 mph. In any case, for hypermiling, it's a waste of time.
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