I have the Banks ram air intake on my truck with an outerwears prefilter. I take the prefilter off regulaly to clean it. I was looking at the main filter on the banks and it looks really dirty, however the 'can't breathe' guage is showing that it is not really plugged at all. Just wondering how reliable those are on the aftermarket filters. I have about 34,000 on the banks filter and it should not need cleaning yet. Also, I have K&N Filter cleaner and oil in my garage for my motorcycles and was wondering if that stuff would work instead of me buying the stuff from banks??