Porsche unveils ultimate 911 Turbo

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It's hard to imagine many owners of the epic 911 Turbo hankering for more power, but Porsche insists the new range-topping S version is the result of customer demand for greater performance.

The 911 Turbo S boosts the peak output of the twin-turbocharged 3.8-litre boxer engine by 30bhp to an eye-watering 523bhp. Combined with 516lb ft of torque, the new Porsche will crack 60mph in just 3.3secs and won't stop accelerating until a heady 196mph appears on the clock.

The extra power makes the new car the fastest, most powerful version of the revered 911 Turbo ever, a feat Porsche has achieved without any effect on economy as the S offers the same 24.8mpg fuel consumption as the standard model.