The BMW Z4 2.5i 192hp (E85 - 2003 - 2008) produces 192bhp and 245Nm in standard form. Our Stage 1 ECU tuning file raises output to 210bhp and 265Nm, a gain of 18bhp and 20Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.