The air filters are exactly the same................even the standard ones are exactly the same!!!

You can also swap the airboxes across but you need the ST170 intake scoop as well which is a common upgrade as it's much larger in diameter - the scoop costs around £20 from Ford and you can also buy the deflector panel (which sits over the bonnet catch across the slam panel) off of the 2.0 litre automatic Focus which has a better intake 'scoop' to get air into the intake