MILLTEK SSXFD308 Particulate Filter back Dual 115mm GT115B FORD Focus Mk4 ST 2.3 litre EcoBoost Hatch (OPF GPF Equipped Cars ymm_43 Extensive in house durability testing 000660 Extensive in house durability testing and development has resulted in improved correlation between test bench and real road data and in house manufacturing allows for quality control of all components which provides the necessary evidence to deliver the 3yr warranty with confidence requires no special tuning and has been used in GT R builds over 600hp and lb ft of torque Rear silencer bypass included in the race system 2019 and later Ford Focus Mk4 ST 2