The Mercedes S 55 AMG - 500hp (W220 - 2002 - 2005) produces 500bhp and 700Nm in standard form. Our Stage 1 ECU tuning file raises output to 550bhp and 820Nm, a gain of 50bhp and 120Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.