Well, the exhaust snorkel DOES have its place, or it wouldnt exist.
I think in a 1/2 ton w/ stock exhaust, you'd be fine. But, every time I think of something for my truck(raising the intake etc), I think about the 5" 'sewer pipe' as my father calls it, running the length of my truck. The sole point is to reduce back pressure after the turbo to nothing, or close to it...
I dont think most gassers need anything like that, they have backpressure in their systems, more than a diesel anyway.
BUT... I have an idea on how to do this, after seeing the Humvees system....
If we all didnt mind a little extra ugly, the snorkle system would work as well...
Chase