The Mercedes E 350 CDI Bluetec 252hp (W212 - 2009 - 2013) produces 252bhp and 620Nm in standard form. Our Stage 1 ECU tuning file raises output to 290bhp and 700Nm, a gain of 38bhp and 80Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.