The BMW 5 Series 525i 218hp (E60/61 - 2003 - 2010) produces 218bhp and 250Nm in standard form. Our Stage 1 ECU tuning file raises output to 230bhp and 270Nm, a gain of 12bhp and 20Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.