The BMW Z4 1.8i 156hp (E89 - 2009 - 2018) produces 156bhp and 270Nm in standard form. Our Stage 1 ECU tuning file raises output to 260bhp and 380Nm, a gain of 104bhp and 110Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.