Genuine Apexi. Air filter with minimal air-flow restriction Dual funnel filter system minimizes intake turbulence Dry-type filter element requires no oiling, and will not foul air flow sensors. The Power Intake is the premier air filter designed to create pure horsepower. The intake funnels used in racing machines take advantage of a characteristic where air travels along the side of surfaces. However, the center portion of the funnel is virtually unused. It is this concept that gave birth to the Dual Funnel design.