2017 ->
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Order This File Ask a QuestionThe Mercedes X-Class 350d 258hp (2017 ->) produces 258bhp and 550Nm in standard form. Our Stage 1 ECU tuning file raises output to 290bhp and 690Nm, a gain of 32bhp and 140Nm, with no hardware modifications required. The file is delivered through the ByteFlash Portal and is ready to write to the vehicle.