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freer flowing to me sounds like a less efficient filter
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Not always. Even with paper filter. A cone filter have a much greater area than a panel filter, thus reducing the pressure drop across the filter.
If you're just looking for noise, desnorkle, it's free and reversible. Nothing beats free stuff!
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Why would people spend a few hundred bucks on something their car already has?
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Because it's not as simple as that

Every car has a system that takes air from outside.
A K&N drop in filter won't change the noise much, a different intake tube either.
If you want more sound, start with the desnorkle, if it's not enough: "cold air" system. And if it still not enough and you have money left, I'll be happy to make you a plenum ahah
Ben