First off, let me say that I have no first hand experience with this, and that my input is purely speculative, based on my knowledge and experience.
Okay, that being said, I agree that it's probably junk. The theory behind the idea makes sense, on paper, for a carburetted engine because with a carb, the air and fuel are entering the intake together, and anything that would atomize the fuel together with the air should increase power and mileage. I would still never use one.
As far as adding it to an EFI combo, I don't see it being anything more than an air restriction, which can't be good.
Take care,
-Chris
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