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 - Style 65 Wheels; 9.5" Square Set up;275 Tires;10mm/3mm Spacers; Black Kidneys;Muffler Delete; 3.5" Dual Tips; Beast Power; "Dinan" Ducts; E60 SSK; BC Coils
--'00 BMW ///M5 .:Avus Blue/Grey/Black:. '01 Exterior Upgrades; E60 SSK
'81 MB 500 SEC Euro Koenig
'91 Alfa Romer 164S- Red/Black/ Recaro interior