The GT-Rs 1.0-liter (62mm) inline-four, with a 2,200-horsepower, 6-cylinder engine, was originally conceived as an engine for a street-legal racing car.
The Hellcat was later adapted into a factory-built street car, and it proved popular enough to have its own series.
But the GT-r is still based on the HellCat, and that means the engine has been reworked into a two-stroke engine.
The 2,180cc inline-4 has a new cylinder head, new pistons, a new camshaft and a new compression ratio.
The new engine is a bit of a departure from the previous Hellcat design, with the main difference being a new six-speed automatic gearbox.
The manual transmission is now standard on the GT R, and the car also uses a new four-wheel drive system.
This will give the GT the ability to go faster than ever before, though the car is still a car that will struggle to go past its maximum speed.
The engine was designed for a race car, but there are plenty of racers on the track, so we can expect the GT to be a capable machine.