Two Sedans with some similarities, but otherwise different in most aspects such as the horsepower, starting price, ground shadow size, and height. First of all, there is a $19,100 difference in the base MSRP. The 2017 BMW ALPINA B6 Gran Coupe has a higher starting price than the 2017 Maserati Quattroporte. Also, the 2017 ALPINA B6 Gran Coupe pulls more horsepower than the 2017 Quattroporte. And finally, the ALPINA B6 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, fuel economy, and maximum occupancy.