The Mercedes E 300 CGi 252hp (W212 - 2009 - 2013) produces 252bhp and 340Nm in standard form. Our Stage 1 ECU tuning file raises output to 310bhp and 389Nm, a gain of 58bhp and 49Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.