Question on aftermarket head units...
I don't think there is enough demand to produce something for this car.
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Yeah, you can retrofit the COMAND MM system in your W204, but you're probably not going to pay a penny less than $2K. And for what? A mediocre stock system.. at best.
Save yourself the headaches...
Going completely aftermarket will mean you'll be tearing into the dash. Not the best option either when it comes to aesthetics... but the performance and features will be unbeatable (if you don't mind losing your existing features). Purely a judgment call on your part.. but it definitely requires professional fabrication. Unfortunately they do not make aftermarket double din molds for newer W204's.
Personally.. I'm going an entirely different route. I'm going to professionally mount a 7-8" 4G android tablet in front of the 5" screen. It will sit on a charger, but be portable whenever I need to remove it. Got an aftermarket speaker setup anyway.. so it's good to go. Pandora, web browser, navigation, youtube, 250gb HDD, games... whatever... and no cutting into the existing stock setup.
Later..




