is not a performance vehicle. It's a luxurious grand tourer. Until a few years ago, Rolls listed the output of its engines as "adequate" or "more than adequate". But the next model from the Spirit of Ecstasy marque could stand to break that particular mold. That model could be the coupe version of the Ghost sedan. Tipped to revive the Corniche name, the new Ghost coupe will carry the same 6.6-liter twin-turbo V12 engine as the sedan, but instead of 531 hp, we could be looking at 600.