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Even if vendors are measuring this specific data you request, which I know some are, they aren't going to share it with their competitors by posting it online as it's proprietary R&D data. It is no secret that stock intakes and paper panel air filters pose a restriction vs. a freer-flowing aftermarket system with a larger, and less restrictive, air filter. Are the gains going to be massive or magical? No, but the C7 guys are typically finding ~10whp to be accurate in independent testing (plus keep in mind the C7 already has a larger stock air filter than the gen6 SS does).
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