i have been loving the hell out of this mod.
The cars run on both ovals and road courses.
http://en.wikipedia.org/wiki/Legend_car_racing The mod does a good job with both aspects.
The cars dont fit the production years for FIA Historic racing, but do fit into GTL's unique physics perfectly. Remember, GTL is not a game placed in the past, but a game of historic cars placed in the present. GTL rolls on modern rubber, and newer brake materials. Lack of downforce is also a good reason for a home in GTL. i would agree that running the Legends mod vs other GTL cars is a bit odd, but running them in the game vs each other, it makes perfect sense.
The cars have alot of power - 140 hp / 1300 lbs. They have little lateral grip. As i recall they are chain driven which is why there is no differential and Power/Coast are non adjustable at 100%. This creates a car that you must drive with very high attention to throttle input. It is not wise to drive hard into a corner and just let off the throttle, it can easily spin. It promotes a driving style that has alot of four wheel and long drifts. It excels as an ovals car for this reason.
i have uploaded a couple setups, both named ROB_Legends to Magny Cours, and VLM Mid Ohio.