K&N Custom Racing Unique Oval Tapered Filter 17.313in OL B/7.75in OW B/14.625inOL T/6.125inOW T/9in - 100-8521 Interior Accessories Each of these options works

Each of these options works with both the 2013-2018 Focus ST and the new 2016-2018 Focus RS

Please note that this kit is only compatible with the 2017 and up G30 5-Series and the 2018 and up F90 M5

The innovative design doubleschange to +-2

and 87350 adjusters

K&N Custom Racing Unique Oval Tapered Filter 17.313in OL B/7.75in OW B/14.625inOL T/6.125inOW T/9in - 100-8521 Interior Accessories Each of these options worksThis K&N racing air filter was designed to fit and seal onto the opening of an unmodified Enderle Birdcatcher fuel injection hat. Enderle Birdcatcher fuel injection hats are used in drag racing, on some monster trucks and on other racing vehicles. This high flow K&N air filter is washable and reusable. It adds little restriction while providing great air filtration. Features & Benefits Top plate, base plate and flange are all made from ultra light