I just installed my OEM cf trunk spoiler on my 2013 dct m3 and it looks amazing. Some will say to get the top painted, I just think clear coated raw carbon fiber is so beautiful,, I would never cover it with paint. That's like bmw painting their carbon fiber roofs.. Doesn't make sense to me.
Do not go after market. The fit will never be as good and perfect as OEM. Why save a couple hundred bucks when you paid so much for your car.
The OEM spoiler is so light bc it's all hallow. It will shock you when you get it as to how light it is over the smaller painted one that came this the car.
My car is a lease, used beta link for perminant fittment and will just turn it in with the lease.. Figure I will get my money's worth in the next couple years.