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K&N was developed here in SOCAL back in the 70's primarily for offroad racing. They have now expanded into nearly every performance motor application. They are good guys. I have used their filters on racing motors since they first started out. They have been tested many times and found to let in both more air and more grit. If a $50,000 purse hangs on the winning car, K&N is my first choice. Will you ever feel the difference on the street or running Auto-X? Nope.
Porsche motors are expensive. I expect long life from my street car motor so I would not consider using a K&N on my Boxter. Every owner should decide for themselves with their eyes wide open.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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