The Porsche 911 3.0T Carrera S / 4S 420hp (2016 - 2018 (991.2)) produces 420bhp and 500Nm in standard form. Our Stage 1 ECU tuning file raises output to 475bhp and 620Nm, a gain of 55bhp and 120Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.