This part is listed by BMW as BMW part number 51192350722 (51-19-2-350-722) and is described as M Performance Carbon Fiber Rear Spoiler for F82 M4 Cope.
This spoiler can be used as an upgrade on non-M model 4 series, but ONLY for the 2 dour coupes. Not for anything other than the F32 chassis 2 door coupe body styles (no convertibles or gran coupe).
Click here for installation instructions for M4 M Performance Carbon Fiber Rear Lip (part# 51192350722)
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BMW Fitments:
4 Series
F82 / F83 (2015-2020) > M4 (2015-2020)
F82 / F83 (2015-2020) > M4 GTS