The M Performance Carbon Fiber Rear Spoiler for my 2016 M4 came with 3M double-sided tape. I used this when I installed it in July 2016. I've done more than a dozen track days, at speeds up to 140 MPH and it's still solid as a rock.
The M Performance Carbon Fiber Rear Spoiler for my wife's 2018 M3 came without anything to affix it, but the directions said to use BMW Betalink adhesive which we bought separately and used to install it. The original Gurney lip spoiler on the M3 is also affixed with Betalink. Very difficult to remove. Really messy with lots of cleanup when using it to install the CF spoiler. She's done six track days and hit speeds up to 130 MPH on the track and it's even more solid than mine.
So apparently both methods, as recommended by BMW, work just fine.
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The Coupe: 2016 M4 | Sakhir Orange | Black Full Merino Leather | CF Trim | M-DCT | More | ED 5/13/16
The Sedan: 2018 M3 | San Marino Blue | Black Full Merino Leather | CF Trim | M-DCT | ZCP | ED 7/18/18
The Roadster: 2006 Z4 | Interlagos Blue | Black Extended Nappa Leather | Carbon Leather Trim | Purchased 7/19/12
Last edited by SD ///M4; 11-14-2019 at 04:38 PM..
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