Originally Posted by coopersim
MEGA is your man for sounds!
Professional is the head unit, you can still have the standard speakers with the Pro head unit.
Loudspeaker system - BMW Business
Loudspeaker system - harmon/kardon surround sound
are the available upgrade options from new
You forgot Loudspeaker system - Individual
Business was about £400
Harman Kardon was about £900
Individual was about £1460
Individual is very good but not £600 better than the HK IMHO.
Of course the price differentials are much less (if anything at all) buying used.
A lot of third party dealerships don't realise they are selling a car with the upgraded speaker system so look closely at pics when buying.
All the upgraded systems have door mirror tweeters
Individual is easy to spot as it has silver speaker covers and is a very rare find outside of the M cars.