Air Filter

Paul

First, there's the matter of filtering ability. Oil bath filtration is the best. It is *far* better then paper filters. It's even better then oiled gauze or oiled foam filters. The order from good to bad is oil bath, oil foam, oil gauze, paper.

Second is the matter of flow restriction. All things equal, oil bath filters are the worse (highest restriction), with paper next, then oiled gauze and finally oiled foam. But, a paper filter cut down small enough to fit inside the very small filter housing of the N would have very little surface area, and might well have higher air flow restriction then the oil bath.

My recommendation would be to leave the oem oil bath air filtration.