PTG next race series starts the 18 July - using the BMW M1 Pro Car. There will be a fixed build, with racers allowed to tune their own cars. Some tunes have already been shared open source through the PTG discord, and no doubt more will.
The series will cover 6 rounds, with each lobby restricted to 16 racers.
Here is the build for the cars - more details available through the PTG forum, Discord, or of course comment below.