E39 - 1995 - 2003
Ready to order this tuning file? Access the ByteFlash Portal to place your order.
Order This File Ask a QuestionThe BMW 5 Series 523i 170hp (E39 - 1995 - 2003) produces 170bhp and 245Nm in standard form. Our Stage 1 ECU tuning file raises output to 187bhp and 272Nm, a gain of 17bhp and 27Nm, with no hardware modifications required. The file is delivered through the ByteFlash Portal and is ready to write to the vehicle.