I really don't know how much the factory Lexicon system could be improved on. Stereophiles that have tested it have been blown away by it. The head unit would be a massive and pricey prospect to change as it would require major surgery and fabrication to reintegrate an aftermarket head unit into the dash. The speakers are good quality. If it is anything like the GM canbus system, total integration of stereo, bluetooth, hvac controls, onstar, rear seat stereo and hvac controls, warning buzzers and alarms, the car needs to be virtually rebuilt and rewired to get it all working again. Personally, the 17 speaker Lexicon system in my Genesis sedan sounds way better than the Harman Kardon logic 7 system in my BMW, and when I got that the system sounded pretty good at the time.
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2010 Genesis 4.6 Tech
2007 BMW 328i E93
2005 Triumph Rocket III
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