Porsche Says Goodbye to the 997 Series with 500HP 911 GT3 RS 4.0 [with Video]

The new 911 GT3 RS 4.0 is Porsche's ultimate street-legal track racer and a fitting farewell to the current 911 series, codenamed 997, which will soon be replaced by an all-new model set to be unwrapped at this year’s Frankfurt Motor Show in September.

There’s a lot to like about the new GT3 RS including the fact that it is fitted with the largest engine ever to be mounted on a factory-approved 911; a 4.0-liter naturally aspirated flat-six unit that develops 500 horsepower at 8,250 rpm, 50 horses more than the standard GT3 RS. It is also the most powerful 911 naturally aspirated engine with 125 horsepower per liter. The engine carries the crankshaft from the 911 GT3 RSR racing car, while the forged pistons' connecting rods are made from titanium.

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