Volant Diesel Intakes are offered with the Primo Filter or the ground-breaking Powercore dry filter. The Volant Primo air filter has additional tiers of filter media to make up for the extreme intake vacuum generated by diesel motors. The PowerCore utilizes state-of-the-art Ultra-Web® NanoFiber™ technology. This fabric is a high-quality synthetic, that will not degrade as effortlessly as common paper elements and cotton/gauze filter media, while also furnishing greatly enhanced filtration up to 99. 99%. Moreover, it's water resistant and never requires oiling.