The epic Ford Mustang Dark Horse GT3 is a beautiful creation made in collaboration between Ford Performance and longtime partners Multimatic and M-Sport. With carbon fiber body panels, short-long arm suspension, a rear-mounted transaxle gearbox, an FIA-GT3 homologated aero kit, and a 5.4L Coyote-based V8 engine, it’s no wonder this thing debuted at the centennial running of the 24 Hours of Le Mans in France, then later stole the show at the Goodwood Festival. But few know that the Ford Mustang GT3 race car begins its journey as a street-legal S650 Ford Mustang shell and transforms into a jaw-d…