The K & N filter is a different material...
the stock filter is foam w/oil. It is washable too...
I use hot water in the scrub sink...massage
very carefully...do not rumple-up & squeeze.
Flat dry between paper towels, then air-dry
until dry. Place the stock filter into a zip-lok
baggie, add a bit of light oil, & gently massage
the baggie to spread the oil around the foam
filter. After removing the filter from the baggie,
place the newly cleaned & oiled filter between
some paper towels, to soak up any excess oil...
then re-install into the air cleaner housing.