All M5's came fully dechromed. It seperated them from the rest of the e28's, along with the front air dam/rear mtech 1 spoiler, sport seats, engine,etc,and sports suspension, that only could be had on the 535iS.
Now, as far as doing this yourself, its completely duable. I was in the process of completely doing it to my e28, before it got totalled. Some of the procedures required are:
Sanding thechrome with a light grid sand paper, primer( a couple of coats), and flat black/or glossy balck paint (fromCT), at which point you can either clear coat, or leave it as it is. This can be done ON ALL of the chrome, but another way u can dechrome the trim, is by using the black tape fouind also in CT.
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--'00 BMW ///M5 .:Jet BLK/BLK:.Individual- Modded
--'07 BMW M5/6.:Indianapolis Red
'91 BMW 850i J Spec Modded
'88 BMW 635CSi Lowered
'81 MB 500 SEC Koenig WILD RIDE