The Volant Cool Air Intakes found here are all specifically for diesel engines. Volant Diesel Intakes are available with the Primo Filter or the ALL NEW Powercore dry filter. Intake vacuum pressures on diesel vehicles is higher than standard gas burning engines. The Volant Primo air filter has more layers of filter media to compensate for that pressure. The PowerCore uses advanced Ultra-Web® Nano Fiber SM technology, which is a high-quality, water resistant synthetic that when compared to common cotton gauze type filter elements, wont deteriorate as easily but vastly improves filtration up to 99.99% without the need o re-oil the element.