Does K N make any air filters for construction machines? I think I may have seen an air filter for a 299D but that's about it
I don't think that would be a good fit. With a dry cab filter, when they get full, you can immediately pull it, pound it out and go back to work. An oil filled filter would be a lot more difficult to clean out, I am not sure whatever extra air flow which might be generated by using a filter like that would make it really much better.