Porsche has ramped up the already heady performance of the 911 GT3 RS through the adoption of a new naturally aspirated 4.0-liter version of the company’s venerable flat-six engine.
The new Porsche Motorsport-developed unit kicks out an extra 50hp more than the 3.8-liter powerplant used in the existing 911 GT3 RS, producing a 911 Turbo-equaling 493hp at a soaring 8250rpm  … Details
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