Audi could be raiding Porsche's engine room for the next-generation S8. According to Evo, Audi will be using the twin-turbo 4.0L V8 found in the Panamera Turbo for the S8. The engine will be detuned from 542 horsepower to 530 for S8. That's still a noticeable improvement from the 513 horsepower the current model produces. Evo speculates the new engine will rocket the S8 to 60 mph in 4 seconds and hit a top speed of 185+.
There will also be a more potent S8 on offer known as the S8 Plus. Again, Porsche will be providing the powertrain. In this case, it will be plug-in hybrid powertrain from the upcoming Panamera Turbo S E-Hybrid. The twin-turbo 4.0L V8 is paired up with a 136 horsepower electric motor to deliver a total output of 680 horsepower and 626 pound-feet. This powertrain will be detuned for the S8 Plus - possibly to 630 horsepower and 600 pound-feet. Still, that should provide a 0-60 time in under four seconds.
The S8 and S8 Plus are expected to debut early next year.