In the earlier decades private teams used Manufacturers cars, they didn't make them from scratch. I can only think of one which was Prodrive and the Mini that I dont think was a factory car.
Heading off topic, but Ralliart? Eventually got bought out by Mitsubishi.
Same was Subaru with Prodrive, maybe tuners getting some backing from a partner Manufacturer would ease the budget effort of the Manufacturers itself, but it could help out filling the entries with...
Disappointing entry after a strong round one.
[ERC] Rally Hungary 2025