I have been reading and reading and have come to the conclusion that the life of an engine is the air and oil. That being said the stock Kawa KAI filters are less than desirable and I want the cone type setup. I want to convert the paper Kawasaki 19hp air filter to the canister donaldson type. I have searched on this subject and the posts are over a year old. The posts I did read talk about parts in the $200 range, but when I asked the Scag dealer he came back with a price of $600. Question - Is there some current part numbers on this upgrade and is this a good thing to do.