The sound is so brutal that occupants need ear defenders to withstand the volume inside the cockpit when the engine comes on ...

Aston Martin drafted in Cosworth to help develop the hybrid powertrain. The British outfit was tasked with building the engine and admitted that the Valkyrie featured the most powerful naturally ...

Cosworth says the final road-going engine is the 257th produced. Aston Martin, on the other hand, will end Valkyrie production ... more so if you remember that sound, emission, and fuel economy ...