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Get the MB quarts first and fit them keeping original HU (or even fit my current pioneer one)stock head unit does not have enough power to run the floors and doors there wired in parallel part of the reason for the horrible sound
IF the HU in the link above is better than what i have then it will be the next thing on the list
Most of the cheaper screen Nav units are feature rich but quality poor.
ELSE get a Amp and amp up the MB quarts connected with the Pioneer HU?
If you want quality sound you will need a multi channel amp no matter what you get.
You will need 6 channels .
Putting in a new head unit comes with side effects.
However it
does solve the eq problem described in the Base System upgrade link without coding or a dsp/frequency flattening device.
http://www.e90post.com/forums/showthread.php?t=1378833
If you want some quality 1000 to 2000 us for
hardware is ballpark.
bimmerfest stereo
http://www.bimmerfest.com/forums/sho...ighlight=ctuna
http://www.bimmerfest.com/forums/sho...ighlight=audio
http://www.bimmerfest.com/forums/sho...ighlight=audio
http://www.bimmerfest.com/forums/sho...ighlight=audio
The solutions for fixing the base system are the same as they ever were . Now there are more aftermarket speaker kits that fit. Currently popular
is the Helix DSP/amps . Bimmertech makes a somewhat plug and play kit using the helix 82dsp.
Partial solutions produce partial results .