The Mercedes E 300 CDI 204hp (W212 - 2009 - 2013) produces 204bhp and 500Nm in standard form. Our Stage 1 ECU tuning file raises output to 260bhp and 600Nm, a gain of 56bhp and 100Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.