The Mercedes CLS 63 AMG S 585hp (C218 - 2014 - 2018) produces 585bhp and 800Nm in standard form. Our Stage 1 ECU tuning file raises output to 660bhp and 1100Nm, a gain of 75bhp and 300Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.