Will try flicking switch just to see.
But pretty sure about the none dimming exterior mirror.
Doesn't mention it when I compared the VIN.
On 335i it says S430A - interior / outside mirror with auto dip compared to my M3, it says S313A - fold it outside mirror.
I can only assume that there are less M3 mirrors around and they didn't bother with the fancy dimming and reversing thing.