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Some motorbikes use a similar idea. Suzuki have a system called srad or suzuki ram air direct. I have also seen the same setup on some cars, mainly old american cars. I read an article on someone who fitted a large scoop to a Honda I think it created something like 1/2 psi at 90mph or something along those lines. So yes I guess there could be some slight gains but nothing significant. the hardest part would be plumbing an air tight seal between the bonnet and carb.