The 2013 V6 Ford Mustang and the 2013 Scion FR-S don't compete directly. The Mustang has 2 more cylinders, 105 more horses and weights about 700 more pounds. However in one important ways they do indeed compete: 1) Price and 2) Fun to drive factor. In fact, we would not be surprised if drovers crossed shopped the two very different cars. Which of course begs the question, which one is better.