Northstar's link reminded me of this I saw last week.
https://www.autocar.co.uk/car-news/...and-porsche-collaborate-2023-le-mans-24-hoursAudi and Porsche to collaborate on 2023 Le Mans 24 Hours racers
The company will join fellow Volkswagen Group firm Porsche in entering under the new LMDh regulations, which give firms freedom to develop their own powertrains but require them to use a spec hybrid system and one of four control chassis, along with other cost-saving measures.
Notably, Audi Sport boss Julius Seebach said the project is being developed in cooperation with Porsche, suggesting the two race cars will be closely linked. He said: “A great strengh of the Volkswagen Group is the collaboration of the brands in the development of road cars. We are now transferring this proven model to motorsport.”