[M5Rick]

Looking more into it Horner says in any case RB Powertrains have an in house set up already done like Ferrari has with engines in the pipeline and full Honda support for 2026 and onwards, so looking at it from a laymans view what would Porsche actually be doing there apart from collaboration and unlikely to actually be building Porsche engine with no planned engineering set up for this.
There is a date 15th October to register with Fia any new car firms coming on board but it's a long way to 2026 and any deals can still be considered after that.
Part RB owner Mateschitz is excited at the prospect of having a name like Porsche on the side of the RB car but RBR officials are looking at the bigger picture.