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Amazing marketing trick that still continues to hook .

In some , probably very few applications there is tiny improvement but that 'improvement' is then applied to everyone they sell.

No way do they provide the level of filtration of a standard air filter .
 

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Drop in K&N are less than worthless because the stock intake plumbing usually is as restrictive (or more) as the filter itself.
IOW, running no filter at all would only make a tiny difference.
Plus, K&N lets about 3X as much dirt through.
 
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