Two Coupes with some similarities, but otherwise different in most aspects such as the modifications, starting price, horsepower, fuel economy, ground shadow size, height, and maximum occupancy. First of all, there is a notable difference in the starting price of the 2016 Audi TTS, which is $133,000 less than the base MSRP of the 2016 Porsche 911 Coupe R. Also, the 2016 911 Coupe R has a more powerful engine than the 2016 TTS, and it gets 9 fewer miles on a gallon of fuel. In addition, although the TTS is slightly smaller, it has a taller body than the 911 Coupe R. And then, the Audi TTS seats two more passengers than the Porsche 911 Coupe R. Among similarities are the body structure and market segment.