The Mercedes GLA 45 AMG S - 421hp (H247 - 2020 ->) produces 421bhp and 500Nm in standard form. Our Stage 1 ECU tuning file raises output to 470bhp and 620Nm, a gain of 49bhp and 120Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.