The GT4 RS is powered by a naturally aspirated 4.0-liter flat-six taken straight from the 911 GT3 but turned around 180 degrees. It makes 493 horsepower at 8400 rpm, up from the regular GT4’s 414 horsepower. Maximum torque is 331 lb-ft, delivered at 6250 rpm, and the engine screams all the way to its 9000-rpm redline.
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