Two Sedans with some similarities, but otherwise different in most aspects such as the horsepower, starting price, fuel economy, ground shadow size, and height. First of all, there is a $14,100 difference in the base MSRP. The 2017 BMW M6 Gran Coupe has a higher starting price than the 2017 Maserati Quattroporte. Also, the 2017 M6 Gran Coupe has a more powerful engine than the 2017 Quattroporte, and it gets 2 fewer miles on a gallon of fuel. And finally, the M6 Gran Coupe body is slightly smaller than the Quattroporte, and in addition to that, it's also shorter. Among similarities are the body structure, market segment, and maximum occupancy.