He claims this is the correct volume, but if you don't like it, try this. I think it can be applied to other cars as well.
The installation location is in the F40/S3 folder. If you already have ext_config.ini, please check the contents and add the following contents.
The default value after equal is 1. Adjust to your preference.
I remember that the reason for the large number of 25x was because we made the interior sound so loud that it was hard to hear.
As stated in the description, you can change the value if you don't like it and I am not forcing this value on you guys.