Fiesta ST MK7 Milltek Sport Resonated Cat Back Race SystemMilltek Sport Fiesta ST 180 Cat Back Exhaust (Non Resonated) More Silencing than Non Resonated Class Quality and Guarantee of the Milltek Sport Brand. Gasket and fitting kit included Huge Increase in bore size to 70mm The new Non Resonated Version of the very popular Milltek Sport Fiesta ST180 Exhaust system. Release the Flow from the new Mk7 Fiesta ST 180 Ecoboost engine with a Milltek Sport Non Resonated Single box Exhaust System.