Modern cars with all the electronic gizmos fitted need a good and correct capacity battery.It is recommended that when a new battery is fitted,the battery management system be programmed for the new fitment,so that the charging circuit is optimised.You could probably get away with not having it done with no ill effect .Also be aware that some Bmw models are fitted with 2 options of battery,one is standard duty,(white pastic case) and heavy duty (black plastic case)usually needed for low temp climates.The correct Bosch battery shoud be fine.If fitting the battery yourself,make a note of all the wiring connectors that are attached to and around the battery area.It is very easy to forget to reconnect some of them,as one is connected to the airbag system.