At 5.26 metres in length, the Maserati Quattroporte GTS is huge, and it's definitely a little uncomfortable on tight bends, but its 3.9-litre V8 comes straight from Ferrari, who know how to build an engine. The Quattroporte GTS will make you grin from ear to ear with to every prod of the throttle. It costs a lot - almost £109,000. It's no city car, but it's an utterly unrivalled motorway cruiser.