SD Pro Mk2/3 Focus cotton panel filterThe SD Pro high flow dry cotton panel filter for the mk3 focus provides an instant improvement in both performance and induction noise and is easily installed in less than a minute. Each filter is manufactured using a multi stage process resulting in a great fit and virtually no seepage of frame material into the filtration media producing the maximum available filter area. Will fit all Mk4 petrol and diesel models including ST 2. 3T EcoBoost and 2.