The Mercedes E 63 AMG 525hp (W212 - 2009 - 2013) produces 525bhp and 630Nm in standard form. Our Stage 1 ECU tuning file raises output to 555bhp and 655Nm, a gain of 30bhp and 25Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.