Ford Fiesta (Mk8) 1L EcoBoost Hybrid mHEV ST-Line GPF Back Performance ExhaustFits 1. 0L Turbo EcoBoost Hybrid MHEV Petrol engine. Cobra Sport performance exhausts enhance the sound, looks and quality of your vehicle giving you the ultimate driving experience. Our sports exhausts range is fully guaranteed to give you assurance of our quality. These Fiesta performance exhausts are made in 2. 5" 63. 5mm pipework and fits from the Gasoline Particulate Filter section backwards (GPF back)these parts replace the centre and rear