Replacement Pre Oiled Air Filters for Power Flow Kits Twin Air Filter only for use with Twin Air Power Flow kits. The same factory treatment that race teams and OEMs receive is now available for all Twin Air users Filters are pre-oiled with Twin Air BIO Foam Filter Oil using our state of-the-art filter oiling machines to provide the ultimate consistency in pore coverage Same industry-leading Twin Air Filter you are used to, now pre-oiled for your convenience Comes in a new, resealable bag for added convenience Available in standard Twin Air replacement filters and PowerFlow Twin Air replacement filters