K&N air filter???
I had a K&N Filter one time in an old 00' MBZ and well, lets say it had major problems and leave it at that. The dealer found pieces of the filter in the engine, not a good thing. I got rid of that car as soon as the dealer fixed it, the bill was well over 1500 dollars.
The dealer found pieces of the filter in the engine, not a good thing.
Overall, I think K&N is decent, but not really a big deal that it's a must-have or must-not-have. Besides spending $$ for a custom-made filter, there's not too many reasons to step outside of OEM offerings. (unless you modded your engine like crazy, of course)
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