The Mercedes GLA 250 Turbo 211hp (X156 - 2014 - 2016) produces 211bhp and 350Nm in standard form. Our Stage 1 ECU tuning file raises output to 250bhp and 400Nm, a gain of 39bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.