Home / Focus / Focus RS MK1 / Air Filters & Induction Kits Air Filters & Induction Kits Showing products 1 to 2 of 2 Sort by:Most popularWhat's newPrice low to highPrice high to lowName A to ZName Z to A Genuine Ford Replacement Air Filter | Focus RS MK1 £20.15 K&N Panel Air Filter Performance | Ford Focus RS MK1 33-2266 £50.39