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My dad's 09 335i has the upgraded system and on our drive to Berlin yesterday, he remarked that my system sounds nicer than his. The DSP does a nicer job with the surround simulation and I felt like tone and bass response were a little better than his car. Of course, I need to get it home and tweak the EQ manually to ensure frequency response is flat all the way through, but I like what I'm hearing so far.
Coming from a car w/ a sealed 12inch sub, there is obviously less thump but I'm not as much of a bass head as I was a few years back.
Otherwise, you get 2 more speakers than the old system. Overall, I'd say it's better.
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