The Mercedes E 350d 258hp (W213 - 2016 - 2019) produces 258bhp and 620Nm in standard form. Our Stage 1 ECU tuning file raises output to 300bhp and 720Nm, a gain of 42bhp and 100Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.