I am interested in creating a custom BOP for the S397 GTE cars for league racing. Is there a tutorial for creating a packaging an upgrade file? Thank you in advance.
I think you can do it with upgrade files. Check here for a tutorial: https://www.studio-397.com/modding-resources/
I assume you could do it the same way Lemans upgrade is done on GTE at the moment, open the MAS upgrade file, check the GTE upgrade ini and edit weight, its in there already.
And if you cant or dont want to mess with the files, you can simply run a /setmass command batch for individual drivers at the beginning of each official session. Requires the presence of server admin though.