I ordered the OEM spoiler mentioned in post #4, it's fantastic. I also have that carbon fiber lip spoiler the OP is referring to - it's sitting in a box right now, brand new. It looks too small for the car to me personally but it also sits right on the back edge, not where pictured back at the top of the thread - it sort of fits into the groove. and no, it doesn't go end to end exactly. got lucky and picked up the OEM one from a BMW dealer on ebay for $195 shipped.
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