Home / Focus / Focus ST 250 / Performance Air Filters & Induction Kits Performance Air Filters & Induction Kits Showing products 1 to 7 of 7 Sort by:Most popularWhat's newPrice low to highPrice high to lowName A to ZName Z to A GGR Focus ST250 Smooth CAIS Cold Air Induction System GGF4001 £478.80 GGR Carbon CAIS Cold Air Induction System | Ford Focus ST250 £598.80 GGR Naked Open Air Induction Filter Kit | Ford Focus ST250 £359.99 Forge Motorsport Air Filter Induction Kit | Ford Focus ST250 2012-2015 £245.00 Forge Motorsport Air Filter Induction Kit | Ford Focus ST250 2015- onwards £245.00 K&N Air Filter Direct Replacement | Ford Focus ST 250 2012- onwards £59.95 Genuine Ford Air Filter | Focus ST 250 £20.31