Read the quote again. If you still don't get it, here it goes:
We have no 4WD V8 sedans from 1990-1992. In order for me to try and replicate a car to fit my DTM grids of that DTM era, the closest I can use, is the 1990 R32 Skyline. It's 4WD and a sedan body. Shorter than the Audi and doesn't have a V8, but can be easily tuned to 450-465bhp, that the Audi V8 DTM produced. Same weight can be replicated as well.
One of the greatest features added to a Gran Turismo game, the Livery Editor. With a bit of creativity, many cars can be replicated from total different makes of car.
So, if PD never add the Audi V8, this is what I'm working with.