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Originally Posted by Rodrunner
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Those are the same threads.
Also stock air boxes are usually a cold air intake, they just have a ton of restrictions and a standard filter.
It's all a matter of removing those restrictions and putting in a better filter.
However I think the cold air intake from GM looks pretty darn good when compared to the stock setup.
Sometimes I've seen things put in the way of the air pipes that when removed will increase air flow.
Such as the sound deadener sheet put right in front of the air box on certain GM trucks.
I once pulled one out of the filter and probably doubled the gas mileage.