Why Is A Cummins Twin-Turbo Diesel Engine Installed In A Ford Mustang?   The most contemporary Ford Mustang has a good 5.0-liter "Coyote" V8 engine that generates a lot of power. But this one has had a diesel lump transplanted into it, as you can guess from the dense black smoke. A 5.9-liter I6 Cummins diesel engine from lorries and US ...