Competing in the fullsize sedan segment, the 2015 Mercedes Benz AMG S 63 Sedan is a direct competitor to the Maserati Quattroporte GTS and the Audi A8 L W12 Sedan. The Porsche Panamera Turbo S Executive Sedan is also a potential rival which is significantly more expensive than others. The AMG S 63 Sedan starts off at an MSRP of $141,450, It is offered with a 5.5L Twin-Turbo V8 engine and a 7-speed automatic transmission, producing 577 horsepower and 664 lb-ft of torque. Through this powertrain, the AMG S 63 Sedan manages a 0-60 of 3.9 seconds and a combined fuel economy of 18 MPG.