Description The COBB high flow filter for your Focus ST250 or RS Mk3 is designed to permit very high flow rates, minimise restrictions, maximize filtration and provide a long life filter. It uses proprietary woven cotton and metal mesh with a precision moulded rubber base. It is designed as a filter replacement and drops directly into your OEM airbox, be it the ST or RS airbox. With the dual-cone design, one can enjoy the turbo sound when air is discharged. This high-flow filter can be used on a stock car or modified and is compatible with the COBB Accessport OTS maps. Pair this with our Induction Hose kit for a fresh-looking engine bay for your Ford Focus ST250 or Mk3 RS.
