The Mercedes AMG GT 63 AMG 4.0 V8 Bi-Turbo 585hp (2018 ->) produces 585bhp and 800Nm in standard form. Our Stage 1 ECU tuning file raises output to 650bhp and 850Nm, a gain of 65bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.