The Mercedes GLA 35 AMG 306hp (X156 - 2017 - 2019) produces 306bhp and 400Nm in standard form. Our Stage 1 ECU tuning file raises output to 345bhp and 480Nm, a gain of 39bhp and 80Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.