Kuryakyn 9328 Pro Series Hypercharger Air Filter Kit Since its inception, the Hypercharger has continued to evolve to meet the needs of the performance-minded rider. What you see here is without a doubt the best flowing Hypercharger Kuryakyn has ever produced. Interior shapes, especially the critical radius leading into the carburetor or throttle body, have been carefully designed. Outer cover incorporates an additional scoop to direct air into a high-flow, washable foam filter element that seats snuggly in the end of round K&N&#174; filter elements. Frontal opening is huge and, as with all Hyperchargers, the vacuum operated butterflies allow almost unrestricted airflow to the filter under high-load riding situations.