Compare Maximum number of 4 items selected K&N Engineering Air Intake System - RK3910-1 Part #: RK3910-1 Line: KAN K&N Engineering Air Intake System 1 Million Mile Limited Warranty Shape: Oval Style: Motorcycle Replacement Filter: E-3980 Hardware Included: Yes Neck Flange Diameter (in): 2-1/4 Inch Neck Flange Diameter (mm): 57mm Air Filter Included: Yes Washable: Yes Air Filter Color: Red Air Filter Height (in): 2-3/16 Inch Air Filter Height (mm): 56mm Mass Air Flow Sensor Adapter Included: No Filter Media: Cotton Pre-Oiled: Yes Air Box Included: No Air Filter Length (in): 9 Inch Show More Show Less