There will be a few minor changes, but they're all good ones. Whereas the concept was based on the old Cayman GT4 Clubsport, the production car will be derived from the new 718 Cayman GT4 Clubsport. It's a subtle name change, but with it comes lighting similar to the street cars, and a massaged 3.8-liter flat-6 engine that, in road race car trim, makes 420 horsepower. On top of that, it will get the plant-fiber composite body panels of the road race car.
The rally class the car is being built to compete in is the FIA's R-GT class. This is a special class for two-door sports cars only, with the cars closely based on street-legal production vehicles. Besides the car type, all cars must have a power-to-weight ratio of 7.5 pounds per horsepower. There are two main car models competing: the Fiat Abarth 124 Rally and the Porsche 911 997 GT3 Cup R-GT.