The BMW Z8 5.0 V8 400hp (2002 - 2003) produces 400bhp and 500Nm in standard form. Our Stage 1 ECU tuning file raises output to 415bhp and 525Nm, a gain of 15bhp and 25Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.