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I dont know anyone who has tested back to back all or even a decent subset of the available intakes. So i suspect all you'll get is people's opinion that will be heavily weighted in favor of whichever one they plunked down hundreds for or got for free.
Besides looks, the only other thing you can really go by is whether or not a particular intake has issues throwing codes due to changing what the MAF expects and not including or getting a tune to correct that calibration.
I can only tell you that the GM one includes a calibration change (which you should hope to be in a non-CARB state to get). And I know that the aFe intake (which i have - purchased with my own money) doesn't throw codes if you dont forget to tighten everything up when installing.
I'd put them all pretty much on the same level in terms of performance. Assuming your engine is otherwise stock (not e85, fi, or otherwise requiring much more air than stock).
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