Uh no… Don’t use K&N filtres…
K&N filters are banned by all racing organisations I've raced with: AFM, CCS, WERA, ASMA, CVMA. I don't know of any that allows K&N. Also banned by majority of trackday providers with more every day.
Design flaw was welded-on nut at end. K&N's official position keeps on changing. Initially they blamed user-error for over-tightening nut. Then it was changed to use nut only for removal. However, filters that never had nut touched are also blowing up. Heat of welding on nut causes carbide precipitation and accelerates stress cracking. Regular heating on/off pressurising cycles causes filter to eventually crack and spray oil onto hot exhaust headers. O-ring on filter also slips out due to oil-pressure.
https://riders.drivemag.com/news/aftermarket-oil-filters-banned-from-various-competitions/
http://www.sttforum.com/index.php?threads/k-n-oil-filters.19691/
https://www.reddit.com/r/MechanicAdvice/comments/6o0eyl/kn_motorcycle_oil_filter_failure/
https://www.vfrdiscussion.com/index.php?/forums/topic/83828-kn-oil-filter-failure/
https://bobistheoilguy.com/forums/threads/oil-filture-failure.260593/
https://www.apriliaforum.com/forums/showthread.php?326687-K-amp-N-oil-filters-BEWARE/
https://www.thetriumphforum.com/threads/k-n-oil-filter-failure.9415/
https://www.triumphrat.net/threads/k-n-oil-filter-leaked.599458/
https://www.triumphrat.net/threads/k-n-204-1-leaking-oil-filter.954458/
If you’ve sustained damage from K&N filter, join following class-action lawsuit:
Sauder Schelkopf is currently investigating a class action lawsuit against K&N Engineering for catastrophic failures relating to its oil filters sold for automobiles, motorcycles, atvs and powersports. It is alleged that K&N oil filters can suddenly separate and shred resulting in possible...
www.sauderschelkopf.com
I've seen 2 of these personally.
2019 - trackday @ Thunderhill East with Trackdayz.com
K&N filter blows entering slowest turn-14. Rider crashes with 4 others behind him who hit oil spill. A brand-new Aprilia RSV4 is totalled. One rider broke both wrists.
2020 - trackday @ Buttonwillow with Pacific Track Time
K&N filter blows entering Bus Stop turn and catches bike on fire. Luckily rider was alone, crashes off-track and bike is totaled from burning oil. Track is closed for 2,5-hrs for clean-up
K&N filter still failed when nut was not used to tightened. Carbide formation and hydrogen embrittlement is already present from welding. Tightening nut just quickened failure. Even without that, repeated heating/presurising cycles will cause cracks and filter will split. Recall was just to calm customers when problem first exposed, but they have not changed design since K&N filters are still failing. This only shows that marketing works.
Yes, there are many alternatives better than K&N if you’re looking for U.S. made filtre.
kandpengineering.com