Ford Focus Mk2 ST225 CAIS air filter, AIRTEC or K&N RU-2800

Direct-fit air filter for Ford Focus Mk2 ST225 CAIS and Group A induction kits - also compatible with Mk2 RS Stage 2 Carbon Fibre CAIS.

• Choose AIRTEC-spec high-flow cotton gauze (universal fit) or genuine K&N RU-2800 (Group A kit only)
• No trimming, no adapters, no guesswork - designed to drop straight in
• Not a full intake system: trumpet not included, and this is a filter-only replacement

Note: K&N RU-2800 is confirmed for Group A kit only - not for standard CAIS or other variants.