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mark3 is cd based, there is a new one, mk4, which is DVD based. The screen i would suggest get a widescreen 16:9 ratio. Also, you will need the radio tuner and also the nav harness. Will run you perhaps $700 or so just for this 2 items. DIY is in the home page, it's pretty easy, i have done the retrofit on a number of 3 series vehicles. Plus, OEM could be more, but it looks better on your dash compared to aftermarket ones, of ocurse, its just my opinion. Thanks!
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