K&N are banned due to a bad production run that caused leaks around the tack welds that hold the nut on. Riders would also use that nut to tighten the filter down and cause leaks in the same area as well. It was easier and safer to just ban them for track days. Its not just K&N as a brand either, its ANY filter with a nut on the end. Hiflo's and the likes.
When 3 filters fail in the same day, something is terribly wrong. Don't be "that guy" who dumps oil on the track.
So, basically your free to use the filter of your choice that does NOT have a nut on the end. If you have one already... should you get another brand? Hmmmm, your call, but you gunna bet your bike and skin on a $4 filter?
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