Plymouth’s answer to the Ford Mustang did not just need to look sporty; it needed to earn the title, and the 1965 Formula S package was how it happened. A 235 horsepower Commando V8 paired with upgraded suspension and a factory tachometer turned an ordinary Barracuda into a genuine performer. Fewer than three thousand buyers ordered it that year, so why did the option that made the car worth having stay so rare?