if you get a true K&N then all you need to do is i would say once a year pull it out and wash it per instructions and get the oil for it and put it back in. the inner liner comes out easy.
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72 442 "THE BEAST", 99 Alero - OSV Replica w/ original OSV parts, HURST Dual/Gate Shifter
Beware of the BackStabber

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