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Order This File Ask a QuestionThe Buick Excelle GT 1.6i 121hp (All) produces 121bhp and 150Nm in standard form. Our Stage 1 ECU tuning file raises output to 131bhp and 165Nm, a gain of 10bhp and 15Nm, with no hardware modifications required. The file is delivered through the ByteFlash Portal and is ready to write to the vehicle.