Audi don't use an in-house hybrid system — it's bought from Williams Hybrid Power (one of the technology sales parts of Williams F1). The Porsche 911 GT3 R Hybrid similarly used a WHP system; I wouldn't be surprised if Porsche have gone down a similar route for next year.
Yep but the Audi Engineers have the experience of integrating it with a car. Things like how the Hybrid system effects chassis setup, tire wear, fuel consumption, race strategy etc. All stuff that is not in the manual that comes from Williams.
