The Rolls Royce Cullinan 6.75 V12 571hp (2018 ->) produces 571bhp and 850Nm in standard form. Our Stage 1 ECU tuning file raises output to 620bhp and 950Nm, a gain of 49bhp and 100Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.