also alot of stock air intakes use crazy restrictions to reduce the noise of the air being sucked in. Air silencers. My QX had two large ones on the intake tube.
I have not ripped the intake apart on the truck yet, but I bet there are necked down areas and/or air baffles and silencers
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2011 BMW X5 M
2009 Mercedes E63 AMG-FOR SALE or TRADE
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