Fiesta MK8 inc ST200 panel filterITG Ford Fiesta mk8 direct replacement panel filter. The Tri Foam System Why foam? Because, compared to paper or other filter technologies, reticulated polyester foam achieves optimum performance against three key criteria: MAXIMUM AIR FLOW the ability to allow air to pass through without causing a large drop in pressure. CLEANING EFFICIENCY the capability to arrest a high proportion of airborne dust while feeding the engine clean air. DUST LOAD UP