The Mercedes A 45 AMG 387hp (W177 - 2018 ->) produces 387bhp and 480Nm in standard form. Our Stage 1 ECU tuning file raises output to 470bhp and 620Nm, a gain of 83bhp and 140Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.