The Mercedes CLS 220d (2.0D) 194hp (C257 - 2018 - 2020) produces 194bhp and 400Nm in standard form. Our Stage 1 ECU tuning file raises output to 220bhp and 460Nm, a gain of 26bhp and 60Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.