The Porsche 718 Cayman GT4 RS was never meant to happen, but this ‘Franken-Cayman’ is alive with the beating heart of a 911 GT3 – the howling 4.0-litre flat-six, making 500 horsepower and pushing you to a top speed of 315km/h. There are lots of questions, and we’ve answered them all for you, but there’s one you need to ask yourself: could you live with this beast?