thread is addressed to @Anthony Monteil This isn't a major issue but more of a revision on the new backfire system. on some cars a sound bite containing a long string of backfires is played on throttle lift off(and coast) for 2-3 seconds but if you get back on the throttle the clip continues to play so the car sounds like it is both off the throttle and on it at the same time which is a bit strange. the clip just needs to stop momentarily after you get back on the throttle.
Yes, this thing is annoying and I think I know how to fix it now. It will require some coding support but hopefully, this won't be too much work