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It isn't all about flow. I actually agree with VR that most intakes probably don't flow much better than stock. The stock design is pretty good for what it is. There are no severe bends or restrictions at all, and the lower part of the air filter housing contains a large port to suck in cold air.
I believe most HP gains come from relocating the MAF and modifying the design to lower IATs. High IATs trigger the CPU to pull timing.
If someone had time I bet they could use a green filter and play with MAF locations in the stock intake and get similar gains to aftermarket intakes...but it will still look ugly!
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