The Mercedes SL 55 AMG 476hp (R230 - 2001 - 2011) produces 476bhp and 700Nm in standard form. Our Stage 1 ECU tuning file raises output to 540bhp and 820Nm, a gain of 64bhp and 120Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.