The BMW Z4 2.8i 245hp (E89 - 2009 - 2018) produces 245bhp and 350Nm in standard form. Our Stage 1 ECU tuning file raises output to 290bhp and 420Nm, a gain of 45bhp and 70Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.