I had the same question also as I went with the Msport pro pack and have enquired directly with BMW genuis on this matter.
They confirmed to me that it comes with this audio system as standard on the BMW i4 in the UK.
Stereo speaker system with 6 loudspeakers:
– 2 midrange speakers in the front door trims
– 2 central bass speakers underneath the front seats
– 2 midrange speakers in the rear door trim
– 100 W system power
DAB Tuner.
It’s a bummer as I was under the impression that it can with the 10 speaker hi-fi system and not the standard 6 speaker above.
My status code is now on 152 and is in production so it is too late for me to upgrade to the HK system which in hindsight seems like a much better upgrade and worth the £900 extra.
Not expecting much from the standard system to be honest and really regret not upgrading to the HK system when I had a chance!