Sorry for posting a non-M thread, but I am struggling to find another forum with as active a user base as this so thought I’d post it here anyway. Hope that’s ok! This is a clip of my 2006 318Ci (N46) starting up cold. It doesn’t make the noise on a warm startup. It also has a tendency to idle fairly rough when cold, but I’m not sure it’s related. Anyone have any idea what this might be?