The Mercedes S 65 AMG V12 Turbo 612hp (W220 - 2002 - 2005) produces 612bhp and 1000Nm in standard form. Our Stage 1 ECU tuning file raises output to 670bhp and 1100Nm, a gain of 58bhp and 100Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.