Air Filter Precleaners filter out the large particles that can clog your engine's intake and decrease performance. Add a precleaner to your air filtration system and maximize engine protection. Pre-Cleaners can extend filter life, reduce downtime and operating costs,improve engine performance,Cummins Filtration offers two pre-cleaner types -- ingestive and ejective. Air filter housings are available in round, rigid panel, & flexible panel types. For engine intake systems mostly replacements for the original air filter housing.