Yes, it's Genuine BMW part.
I remember some of the threads where they talk about different part # for pre facelift (mine) and for post facelift.
I also remember that the one for post facelift doesn't look as good IMO, lines are more sharp.
I paid $300 for mine many moons ago which is probaly $450 in today's money but I'm not regreting it. It's rock solid without drilling, bolting or whatever.
IIRC, you can optionaly glue it with special adhesive but I've never seen a need as it sits tight and snag.
Here it is almost 8 years ago when I put it on my 98 540:
https://www.bimmerforums.com/forum/s...M-Aero-Spoiler
Still avaliable:
https://www.ecstuning.com/b-genuine-...r/82629407929/
Also, the old crew (JimLev, Philly and others) will remember these, lol:
http://www.bmwtips.com/tipsntricks/
The install instructions are in here
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