[Doru in Romania]

Hello First! New here. Just got a 330d cabrio (E93), since nothing could be ordered with immediate delivery had to buy a company car from dealer with 18000Km on it. Got a good discount too and an M-pack to be installed as a bonus. The problem I have is the sound which is very bad, I was used with Logic 7 in a 7 series, DSP in an X3, Hi-Fi in the new X5. This one really sucks. There is no mention about sound in accessory list so I assume this is the very basic. Car has navigation and TV. Any ideea on how I can upgrade the sound? Any module to replace? Speakers? Radio? CD? Amplifier? Whatever? Also no BT but I was told it can be retrofitted, price is very high though, about EUR 1500 including labour, as car has no BT pre wiring either.
Thanks for any input.
P.S. Interested only in OEM solution