Twin Air Pre Oiled Air Filter - Fits: Husqvarna FE 450 2017-2018 Same factory treatment that Factory Race Teams and OEM's receive is now available to all Twin Air customers. Pre-oiled with Twin Air BIO Foam Filter Oil using state of the art filter oiling machines, which provide ultimate consistency in pore coverage. Same industry leading Twin Air Filter that you are used to; pre-oiled for your convenience. Comes in new re-sealable bag for added convenience.