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Whether 135, 335, 535 or M3, you can swap the head unit display for an aftermarket that has a touch screen and CarPlay and a rear view camera can easily be added. I did this in my M3. Some will say the sound is not as good since it will be through the aux port but I am not an audiophile and did not notice. My biggest complaint was increased glare but an anti glare tablet cover helped. Cost was about $300 a few years ago. For audiophiles or those with big budgets, newer idrive can be added, even the NBT.
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