Marlayne, right now, K&N only makes an oil Filter, KN191 I believe, but no air filters, at least one that will fit in our airbox. If you go the route of removing the airbox and going with the freak kit, then they use a different K&N filter, but don't know the number (no plans on doing the Freak right now). Unifilter makes a filter for our bikes though, and I think probably just as good as K&N.