If you want your family car to be faster than is strictly sensible, you’ve got a lot of options. These are two of the latest, and the best.

The Mercedes-AMG GT 4-door S is among the fastest and most expensive. It has a 4.0-litre V8 making a whopping 630bhp, which is sufficient to push the GT to almost the 200mph mark (where conditions allow, obvs).

And its fiercest rival is the Porsche Panamera, which we’re also testing here in the top available specification. The Porsche Panamera Turbo S E-Hybrid, then, gets a total of 671bhp owing to a twin-turbocharged V8 engine but also an electric motor, giving it a short electric-only range, but all the performance in the world when motor and engine are kicking together.

But which is nicer to drive? Which has the better interior? Which is more spacious? Join us on an extensive test of the two most desirable fast four-doors. Subscribe now: http://smarturl.it/autocar

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