ACUITY Replacement Air Filter for 1891 Cold Air Intake KitsDirect replacement for the filter used on ACUiTY's 1891 Curl Control Intake Kits for the 2012 2015 9th Gen Honda Civic Si 6" (152mm) opening, ideal to mount to a 6" velocity stack 5" (127mm) overall height, 7. 5" (190mm) max width Washable, reusable, cotton gauze construction Includes hose clamp for filter Red filter element with black rubber This is the same filter used in all of ACUiTY's 1891 Curl Control cold air intake systems for the 2012 2015