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it is indeed largely about surface area. you must have AT LEAST as much surface area as stock.
that being said, COLD AIR INTAKES WORK if designed properly.
K&N is a great filter. properly oiled, cleaned, and maintained, it does an outstanding job. ignored, over-oiled or dirty, not so much, but then neither does a paper filter.
for a cold air intake to work, it must have a large filter, a cold location with good air access, and the connecting tube must not be subjected to heat, nor have a lot of bends in it, and it must be no smaller than the entry to the engine.
the one above will not work well. the hose is kinked, and the ridges create resistance. the housing is too small, as is the filter inside it. at a bare minimum, that setup should be reversed, with the filter on the outside, and the hose between it and the intake point. serviceability may become an issue at that point though, as well as water entry
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