Volant 04-05 Ford F-150 4.6 V8 Pro5 Closed Box Air Intake SystemVolant air intake systems utilize a high velocity venturi filter adapter which provides a smooth transition through the MAF sensor into the intake tube for a much needed airflow improvement over the factory rubber tubing and resonator box. Volant's Cool Air box is larger than the factory unit and incorporates a larger opening to collect a higher volume of colder ambient air. This model includes a Pro 5 filter which gets reoiled every 10,000 miles and