My buddy has a K&N cold air intake and he was wondering if there is any other filter that will fit on his K&N intake tube? he is looking to switch to something different.... thanks in advance guys

 

I'd just measure the ID of the K&N filter or the OD of the intake tube and use that as a starting point for finding a new filter. Then I would determine how big a filter I could shoe horn in under the hood out of the ones that fit the tube. When I was looking for my Amsoil filter at their web site, they listed the dimensions for each filter they offered.