Hopefully!
In Project Cars 1 SMS made the Group A cars competitive with each other whereas in reality they weren't - The Sierra was more powerful and faster than the BMW and competed in a different class within Group A - the BTCC at that time was split into 4 classes based on engine capacity with the Sierra in the top class due to a multiplication factor applied to non-naturally aspirated engines.
The Skyline was competitive in Australia with the Sierra under different rules than those used in BTCC.
Hopefully SMS have again twisted reality slightly and made the BMW (E30) M3 competitive with the Sierra. Also I hope the Group A R32 Skyline and the V8 DTM Audi run at the same pace as the Sierra.
I also hope that the Mercedes 190E Cosworth (from PC1) returns to battle with these cars, but I notice that it is not currently listed in the car list. Is there any news on this car?
@jake2013guy and others?