A bunch of friends have regular weekly GT5 racing using the "Lounge" facility.
Last night I experimented with a "single model" race. Where you can set that everyone has identical cars in the "Regulation" menu.
Even if the person doesn't have that car they are still assigned it. When I did it ever car was visually identical (all the same colour).
Although I have a garage of over 200 cars I could only choose from a limited list of cars.
Is there any logic behind this limitation? For example can we only use premium cars in single model races, or maybe cars that the race-host hasn't modified in their own garage?