The size of the part that clamps on is the main thing. You need a nice tight seal, and whether or not it fits in your airbox. you can always adjust air/fuel ratio to compensate for a smaller filter.
Air filter
What is a good jet size to go up to on a 300 fourtrax 1990 mod and a 400ex 2000 model both K&N air filters. I had bigger jets in my 400 but when I rebuilt the carb I forgot to get bigger jets and the ones I had are missing.
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