Volant Diesel Intakes are supplied with the Primo Filter or the innovative Powercore dry filter. The Volant Primo air filter has supplemental divisions of filter media to support the serious intake vacuum produced by diesel powerplants. The PowerCore employs space-age Ultra-Web® NanoFiber™ technology. This material is a top-quality synthetic fabric, that will not break down as quickly as typical paper elements and cotton/gauze filter media, though also supplying drastically superior filtration of up to 99.99%. Furthermore, it's water resistant yet under no circumstances involves oiling.