While the facelifted Quattroporte and Quattroporte S make do with a 400hp (298kW) 4.2L V8 and a 430hp (320kW) 4.7L V8 respectively, the new Sport GT S produces 440hp (328kW). The small power bump is courtesy of a high-flow exhaust system, which comes with an adjustable valve to keep the engine muffled around town and let loose once in the open country.
Along with the engine upgrade is a lowered suspension set-up, stiffer springs, and new shock absorbers. The Quattroporte’s ZF six-speed automatic transmission remains, however, in the Sport GT S the paddle-shift operated ‘box receives new management software that allows for quicker gearshifts.
Inside, the car’s usual wood panels are replaced with carbon-fiber pieces, while the seats are covered in a mix of leather and Alcantara. The exterior, meanwhile, only receives subtle updates such as blacked-out headlight surrounds and a darkened grille.
The first vehicles are expected to arrive in U.S. showrooms shortly after the Detroit debut, and according to Edmunds pricing will start at $138,400 - including a $2,600 gas-guzzler tax and a $1,800 destination charge. This is only $1,000 less than the stunning GranTurismo S, which made its debut earlier this year.