M4 fighter set to be powered by a twin-turbo V6.
Having been caught arriving at the Nurburgring with the upcoming CTS-V, Cadillac has now been spied doing likewise with the smaller ATS-V Coupe. The BMW M4 and Mercedes C63 AMG-fighting coupe is expected to use either a new 500-hp 3.2-liter twin-turbo V6 or a 3.6-liter twin-turbo V6 rated at 425 hp. Rumors of a V8 model are also still floating around. As for its design, we can see a revised grille, a more aggressive front bumper, aerodynamic side skirts, larger rear spoiler and quad exhaust.