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The last year the Grand Prix GTP model was available was in 2005, and featured an extra 20 horsepower for a total of 260. However, due in part to the rise of many similar competitors and the less ...

In its review, Car and Driver reported the 2004 Pontiac Grand Prix GTP's supercharged 3.8-liter V6 horsepower increased to 260 and torque to 280 lb-ft.