Volant 01-07 Chevrolet Silverado 2500HD 6.6 V8 Air Intake System with ScoopVolant 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. The Periscoop uses Volants sealed air filter box and high velocity air intake