I've always wondered about this topic of is it more effective. Shorter/straighter intake should in theory be more responsive at least if you've ever tried breathing through a long straw. when some seem to draw from inside the engine bay you must wonder how 'cold' the air really is, some styles do draw from outside but so does the stock box. I'm leaning towards just butchering the resonance chamber off the stick intake for a bit if extra pachoo factor. In theory this leaves another hole for air to flow into the filter and onwards. My 2 Bob, not an engineer or physics professor but tuners say it's true just call them for a random argument

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06 sti