you know the ones i'm on about, b&o orharmon kardon or whatever they are called this week types where you pay 5 grand for posh sounds and they stick in a different make of speaker

are they really that much better than the standard systems?

and are they worth the price?

and if they are, can you have them retro fitted?

etc

plenty of passionbmw/audi type owners here so it's the place to ask right