Porsche has unveiled an updated version of its 911 GT3 RSR racecar, which will participate in next year�s GT Championship. The German firm's engineers modified the exhaust system and air intake housing, with the 4.0-liter boxer powerplant delivering 5 more horsepower, for a total of 455 hp at 7,800 rpm. While the power increase isn't much of an improvement, Porsche claims that the six-cylinder unit is better adapted to different fuel grades and its driveability is superior compared to the outgoing model. Read more �
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