You need a adress/domicil in germany, without this is it not possible, to get a insurance for your car ans so your DE number plates.
Is this really true, you can get a insurance in your country, when the car have not Euro 3 !?
Unbelievable!
In germany you can buy a system
(twintec) for you engine, it change your emission-level from Euro 1 to Euro 2.
From Euro 1 to Euro 3 i know nothing.
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Es wird immer nur eine Marke geben mit Freude am Fahren und das ist BMW.