hmmm...pagkakaalam ko,apexi makes aftermarket air filters made of very fine steel/metal mesh -- as against your usual paper filter. it supposedly gives you better air flow while managing to filter out the usual gunk that can kill your engine. ang nakaganda sa kanya, you don't need to apply anything on the mesh to retain its filtering capabilities, unlike K&N where you need to put some sort of oil(some suggested WD40) na pang maintenance.

i think someone posted a link here somewhere comparing aftermarket filters; in fact, dito ko nga unang narining ung apexi na brand.

dunno if anyone is selling this here though.