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I don't think it's necessarily a turbulence issue. On the airaid system, the snorkel is significant bottleneck. By removing it, the temperature of the air you're drawing in goes up a little, but the extra air you flow more than makes up for it. On the stock intake, however, the snorkel isn't a significant bottleneck, so all you really get is the warmer air, which in turn reduces power.
Just a theory, but if it's true it would explain those results.
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