The BMW Z4 3.0i 258hp (E89 - 2009 - 2018) produces 258bhp and 300Nm in standard form. Our Stage 1 ECU tuning file raises output to 278bhp and 320Nm, a gain of 20bhp and 20Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.