WRC mainclass from 2027

[WRCStan]

again...

There's no FIA source I can find directly saying they have to come from production runs nor be already homologated Rally2. All the language is 'base' and 'basis' as in tech spec and power-level philosophy. Until this is made clear I'll remain open to the possibility I can build 10 engines to Rally2 tech specs in my shed.

There's also the possibility that what goes for 2027/2028 isn't the long term. Because moving away from relying on manufacturers building cars to relying on manufacturer to power the new cars makes 0 sense.