Two Coupes with some similarities, but otherwise different in most aspects such as the modifications, starting price, horsepower, fuel economy, and height. First of all, there is an $89,650 difference in the base MSRP. The 2016 Porsche 911 Coupe GT3 has a higher starting price than the 2015 BMW 4 Series Coupe. Also, the 2016 911 Coupe GT3 has a more powerful engine than the 2015 4 Series Coupe, and it gets 8.5 fewer miles on a gallon of fuel. In addition, the roofline of the 4 Series Coupe is slightly higher than the 911 Coupe GT3's. Among similarities are the body structure, market segment, ground shadow size, and maximum occupancy.