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I recently installed a k&n drop in air filter. Upon inspection of the air box I found that there is a carbon type looking filter built into the lid of the airbox. I also observed that the factory air filter has an additional layer of material like a 1/2 in of poly Filter matting. At 15,000 miles this poly filter matting was extremely dirty. I also removed the additional carbon type filter built into the lid of the airbox. Has anyone else had the same experience and do you know why there is additional filtering materials?
 

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I don't know for sure but I would hazard a guess that a team of engineers collectively smarter than any of us who were paid big bucks to design a proper intake for this motor found sufficient reason to convince even the the tightest bean counters at FCA that the extra material (and cost) was necessary. Maybe its good at keeping water from getting sucked into the intake when you ford a big mud puddle. Its undoubtedly good at keeping sand and fine particles from entering the engine when driving down dirt roads and dusty trails.

Whatever it is, your motor will no longer enjoy its benefits, but it WILL probably sound like a super cool vacuum cleaner so, not all for nothing ;)
 
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