With Williams working on the development of the 964-based six, along with input from one of Porsches own motor maestros, Hans Mezger, it's likely not going to be far from perfect as far as naturally-aspirated performance air-cooled motors go (talk is of 500 horsepower and redlining near 9,000rpm, and you can read more about the enginehere ). We still can't really see it besides the old renderings included up top, but earlier today Singer tweeted a new clip of some engine testing with Williams, so we at least know how it might sound from inside and outside whichever car it ends up in. And it sounds like being trackside at IMSA in the '70s. Whatever the end result may be, it's safe to say it will spawn a new crop of imitators, but surely hold onto the high watermark it's soon to set. Get ready for the paradigm to shift again.
https://www.youtube.com/watch?v=1KgO8QbXKgw