Nissan considered a V-8 for the next GT-R but has opted instead for a specially developed twin-turbo V-6, due to its lower weight and explosive power potential. A limited-edition 2005-model GT-R Z-tune, fitted with the now superseded twin-turbo straight-six, generated over 500 horsepower, showing the potential of this car. Britain’s Cosworth is helping Nissan extract more than 450 horsepower from the upcoming 3.7- or 3.8-liter V-6 while still meeting emissions laws.