At the 2009 North American International Auto Show in Detroit this January, Maserati will take the wraps off the sportiest Quattroporte yet. Based on the Quattroporte S, the new Sport GT S gains a more powerful version of Maserati's 4.7-litre V8 engine with a remapped ECU that delivers an output of 433HP. Maserati also updated the gearshift management software while the front and rear suspension system gets new single-rate dampers, stiffer springs and lower ride height. Other mechanical changes concern the new sport exhaust system which is controlled by pneumatic valves for a deeper and more throaty sound bite.

Cosmetic changes over the standard Quattroporte S include a new black grille with concave vertical fins featuring the Trident logo with red accents, a metallic titanium finish for the headlights, body-coloured door handles, black finishing around the doors and black twin oval exhaust pipes. Inside the sportiest Quattroporte boasts new M-design seats with perforated Alcantara and leather upholstery as well as titanium colored composite material for the trim.