The Mercedes S 350d 286hp (W222 - 2017 - 2019) produces 286bhp and 600Nm in standard form. Our Stage 1 ECU tuning file raises output to 380bhp and 800Nm, a gain of 94bhp and 200Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.