The side effects of installing an aftermarket Head Unit in the E90 series
Its not the normal easy install that pre 90's cars are.
Depending on what already is in it.(which BMW stereo)
You cannot remove the existing head unit without the following probelms
If you have BMW SOS it will cause error codes
The audio alarms for the seat belts and other things come through the head unit
Without the OEM Head unit installed the BMW programmer at the dealership
will not be able to update your software if this is necessay
If you have logic 7 it uses a proprietary fiberoptic connection to the amp
which means you pretty much have to find away to replace the 9 channel amp and speakers.
For these reasons some mount the existing head unit in the trunk or elsewhere in the car and run there new unit as a parallel or somewhat parallel system.
http://www.e90post.com/forums/showth...hlight=dynavin
http://www.e90post.com/forums/showth...hlight=dynavin