[ghostvet]

From a PRACTICAL standpoint, after comparing the 49 state airfilter the local dealer has to my California filter that the dealer does not have...I don't see why they won't interchange. I can't see where the micro amount of oil/gas that would normally contact the charcoal unit is going to hurt the paper element.

Your thoughts please? Thanks!

A 49 state filter? A California filter? What are those... never heard of them before...

Is it something that California requires something special and the rest of the country uses a normal filter? What is the difference?