I'm no engineer, or even a gearhead, so I could be way out of line, but:
If they actually provide the same horse as the g3, it's not because it's getting cooler air from down below like the G3, it's getting it by sucking more air. So we would have to ask ourselves why it's sucking more air, which could be the angles or size of the pipes, the surface area of the filter (less likely), or the filtration rate. I don't believe it's the first two, so my thoughts go to filtration. Less filtration = increased air intake. Unfortunately, that also means more junk into your engine.
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