2003 - 2012
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Order This File Ask a QuestionThe Mercury Grand Marquis 4.6 V8 239hp (2003 - 2012) produces 239bhp and 382Nm in standard form. Our Stage 1 ECU tuning file raises output to 260bhp and 400Nm, a gain of 21bhp and 18Nm, with no hardware modifications required. The file is delivered through the ByteFlash Portal and is ready to write to the vehicle.