The only spoilers they make for an M4 F82 in an OEM shape/flow with a slightly higher gurney flap is listed below. They also fit incorrectly. OEM uses very thin vacuum bagged CF that can flex and twist. Aftermarket parts are a mold that uses fiberglass as a base with CF overlay. It does not flex, it does not give. For example, I have the M performance oem spoiler and you can twist the spoiler from side to side a full 120 degrees.
1)
https://www.modecarbon.com/product/f...mance-spoiler/
2)
https://vorsteiner.com/products/bmw-...-pp-1x1-glossy
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MGM Ext, SO int, Euro IKON, CS front lip, Carbon 1.5 diffuser, GTS/CS coding, M perf rear spoiler, & everything else STOCK.
(Previous E39 and NA1 NSX owner) Those were the days!