The Mercedes S 350d (3.0D) 286hp (W223 - 2020 ->) produces 286bhp and 600Nm in standard form. Our Stage 1 ECU tuning file raises output to 380bhp and 820Nm, a gain of 94bhp and 220Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.