The 2022 Porsche 718 Cayman GT4 RS will have the same 4.0-liter unit that is fitted to the 911 GT3. That’s the one that revs to 9000 rpm and makes a peak of 493 horsepower. The output represents a 79-hp increase over the existing Cayman GT4 and 10 hp less than the engine makes in the GT3.
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