The Mercedes E 300 CDI Bluetec 231hp (W212 - 2009 - 2013) produces 231bhp and 540Nm in standard form. Our Stage 1 ECU tuning file raises output to 270bhp and 600Nm, a gain of 39bhp and 60Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.