Years ago, when I was in University, the car assigned to me was an old Colt. Since it was my first car, feeling race car driver at gullible din, naka VHT orange paint yung headers, cables were electric blue, valve head covers were polished. Port & polish din syempre. Filters were changed to Ram-Flo ( wala pang K & N noon). Dirt was not filtered & engine suffered premature wear after a few years. Blow by, excessive oil consumption, burning oil... Hard lesson learned. This experience dissuaded me from ever using those so called high performance filters for my everyday ride. Since then, all filters pertaining to the engine are OEM. I just treat the expense as part of the yearly maintenance. If I have a toy car I use for competition, ok Lang to use performance filters otherwise, OEM. I don’t believe they’re bought because they are cheaper in the long run. Pang porma at pasikat yan IMO & what is an additional P600-1k every 10k. I don’t mean to bash anyone. This is just my opinion.