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In my experience with K&N drop in filters, their is no tangible performance gain.
Theoretically, with K&N pods, you are altering the intake length, which alters the torque curve, which could mean lots of things...it would have to be tuned by a well calibrated pair of pants, or a dyno.
I HAVE read in some extremely dusty dirty environements that the increased airflow is accompanied by increased fines passing to the engine, and therefore increased engine wear.
It does keep an extra couple of filters out of the land fill though...and they come with a neat orange sticker that is fun to put on things.
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