That is involved.
If one can do it themselves it might work.
But if you have to pay BMW to do it, it might cost as much as B&W upgrade
They have subs for some cars like G20 3 series as well. No amps yet.
So the pack is - $895 for speaker upgrade
$547 - subs
10 hours of install? at 120 ah hour - $1200
Has anyone heard them ?
Where do they source the speakers from?