Modena, Italy  - Italian sports car maker Maserati has expanded its range with an upgraded version of the Quattroporte and has hinted at a new drop head model for the autumn.

The four-door limousine is already no slouch and thanks to an extra 10 brake horsepower from its 4.7-litre engine, the makers in Modena promise enhanced performance.

Revised software for the six-speed automatic gearbox enables the V8 unit to rev happily above 6,000 rpm, freeing up more power for acceleration and top speed.