2004 - 2007
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Order This File Ask a QuestionThe Buick Rainier 4.2 V8 279hp (2004 - 2007) produces 279bhp and 373Nm in standard form. Our Stage 1 ECU tuning file raises output to 295bhp and 395Nm, a gain of 16bhp and 22Nm, with no hardware modifications required. The file is delivered through the ByteFlash Portal and is ready to write to the vehicle.