I know there's a lot of lasting negative feeling out there regarding the infamous K&N filter, including among our best respected advisors here. Decades ago I had a K&N as part of a Banks Engineering installation on our old Pace Arrow. A few times I did the wash and re-oil thing. No problems. I was cognizant and wary, however after reading warnings here and elsewhere, about putting one on our Beaver.
So I would be remiss not to add to this discussion that things change, and perhaps a re-examination is in order. A consult with Robert Henderson of Henderson's Line-up in Grant's Pass made me aware that the K&N isn't the same as it was. Yes you can clean it, but re-oiling it is not in the procedure. With the demise of the oil application that required larger, coarser fabric for air to get through past the oil, the media could be made deeper, multi-tiered, and finer to trap all particulates; I'm no engineer certainly, but I view it sort of like our 10 micron into 2 micron fuel filter principal, only with more levels.
Robert went through the factory not too long ago and was impressed with the revamped engineering behind recent filter models relevant to diesel rigs. He is one of those fellows whose opinion about performance engineering one has to respect, and he changed his attitude toward the brand. He has no concerns these days about putting one on a diesel coach. That's not something to brush aside.
I'm not saying to run out and buy a K&N. I'm simply proffering reasons to research and consider the newest versions, rather than cast the brand aside based on a perhaps aged reputation. Certainly if that doesn't prove enough or the initial cost puts one off, then the easiest and known-dependable route is a genuine CAT or Cummins filter.
Without a doubt some wouldn't ever avert from using only CAT or Cummins filters, and that is to be respected for its reasoning; my approach over the years with regard to manufacture-branded parts usually has followed accordingly. I just wanted to provide more than one side to the discussion, as it seems strongly lopped. I hope it is helpful.
But Keith was asking about an entirely different brand than K&N anyway, as I take it.
Joel