K&N RU-1720: RU-1720 Round Straight Air Filter Flange Dia. (F): 2.25 in. (57 mm)
2.25'' (57 mm) Flange Dia. (F)
Round Straight Air Filter Flange Dia. (F): 2.25'' (57 mm) Outside Dia. (D): 3.5'' (89 mm) Length (L): 6'' (152 mm) Top Style: Rubber Flange Length (FL): 1'' (25 mm) Flange Angle (FA): 20º Flange Offset: 0''