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Originally Posted by m0wens
Don't really have an argument but I believe that the car manufacturers do not put on the best parts due to trying to keep the cost down. This in turn does not give the car/truck the best performance. The job of the manufacturer is to build the cars but not necessarily make each car/truck perform at it's peak. Just my opinion.
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Also, in my experience with the magazines and manufacturers, a big factor(!! is also graded by test magazines!!) is internal noise at idle, WOT, etc...
These stock intakes and filter housings are designed to give best noise cancelation under normal driving conditions. The aftermarket CAI's are QUITE a bit louder as anyone who has them can attest to. Most people love it, but some manufacturers are louder than others. Check out some other threads on this and you'll here members talk about annoying sounds and vibrations at certain RPM's that they never had with the stock box.
Long story short: You DOOOOOOO gain HP; You WIIIIIILLLL hear it more, maybe to the annoying point for some.
Just my .02