Two Coupes with some similarities, but otherwise different in most aspects such as the modifications, horsepower, market segment, fuel economy, ground shadow size, height, and maximum occupancy. First of all, the 2015 Dodge Challenger SRT Hellcat has a more powerful engine than the 2016 Audi S5 Coupe, and it gets 4.5 fewer miles on a gallon of fuel. Also, not only 2016 S5 Coupe is slightly smaller, but it's also shorter than the 2015 Challenger SRT Hellcat. In addition, you'll seat one more passenger in the Challenger SRT Hellcat than in the S5 Coupe. Among similarities are the body structure, market segment, and starting price.