The Mercedes S 600 V12 Turbo 517hp (W221 - 2005 - 2013) produces 517bhp and 830Nm in standard form. Our Stage 1 ECU tuning file raises output to 585bhp and 910Nm, a gain of 68bhp and 80Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.