Add Amplifier to BMW sound system
My question might look stupid but...
Is it possible to add an amplifier to the Bimmer sound system?
I have a 2007 525xi, It comes with 2 factory subwoofer (I don't know where are they located), No CD charger, iDrive but no nav.
Is it possible to replace the subwoofers with something better.
PS: I don't want to put a subwoofer in the trunk, just replace the factory ones.