Two Coupes with more similarities, such as the body structure, market segment, fuel economy, ground shadow size, height, and maximum occupancy, than differences, like the starting price and horsepower. First of all, the 2017 BMW M6 Coupe is priced $19,125 lower compared to the base MSRP of the 2017 Maserati GranTurismo. And finally, the 2017 M6 Coupe pulls more horsepower than the 2017 GranTurismo. Among similarities are the body structure, market segment, fuel economy, ground shadow size, height, and maximum occupancy.