Well, since those lovely Rileys have come out from Fly....
I've been doing a bit of research into this whole Grand-Am racing. And it looks like a way of getting rather diverse fields, though maybe not enough of the Rileys have been released yet in terms of livery.
At these Grand-Am events there are the Riley cars (DP class), and the GT class, which interestingly enough runs the following cars
Acura TL, BMW E46, BMW M6, Chevrolet Corvette, Dodge Stratus Coupe, Ferrari 360 Challenge, Ferrari 430 Challenge, Infinity G35 Skyline, Jaguar XK8R, Lexus IS350, Lexus SC430, Maserati Trofeo Coupe, Mazda RX8, Mercedes CLK 430, Mercedes SL, Nissan 350Z, Pontiac GTO, Porsche GT3 Cup, Toyota Celica GTS, Toyota Solara...
Talk about big fields!
As mentioned, there aren't enough of the Rileys released yet in different liveries, but one can only imagine that'll change shortly... Even if it doesn't.... If you check out http://www.grand-am.com/rolex/, there are a LOT of teams.
While I don't expect this to become a new class, I just thought I'd throw it out there.
Plenty of good liveries that one could do a repaint of, if one chose to...