The Mercedes SL 63 AMG V8 BiTurbo 585hp (R231 - 2012 - 2015) produces 585bhp and 900Nm in standard form. Our Stage 1 ECU tuning file raises output to 660bhp and 900Nm, a gain of 75bhp, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.