Fictional homologation specials (road cars) of racecars that did not need to be homologated in real life, complete with factory paint, a reasonably furnished interior, turning indicators, and a slightly detuned engine. Think the Toyota GT One Road Car for a real world reference.
Intended as a way to introduce racecars into Forza Horizon, but in a manner that does not clash with the rest of the game’s car roster of mostly road cars and track toys. It is also a unique feature that I have never seen another racing game do, and would definitely require some imagination on the developers’ part besides simply scanning a real world model.
Possible cars that could be candidates for original homologation specials include the Mazda 787B, the BMW Z4 GT3, and the Audi R10 TDI. Many more cars from different racing disciplines and eras could also apply.