The BMW 5 Series 525D 197hp (E60/61 - 2003 - 2010) produces 197bhp and 400Nm in standard form. Our Stage 1 ECU tuning file raises output to 250bhp and 500Nm, a gain of 53bhp and 100Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.