On the CF Front splitters I've only used 3M tape, because I know I have to change the splitter due to braking them. But the rear spoiler I used beta link. Don't plan in breaking it on the road, LOL, and also don't plan on selling it.
For the front 3M and rear Beta Link
BMW M3 E92 2011 ZCP 6MT
- Upgrades:MS Stage 2 Intake + Turner Test Pipes + BPM Stage 2 Tune with Coding; Fox Red Novillo/Carbon Leather/Competition Package/Premium Package 2/Convenience Package /Enhanced Premium Sound/Satelite Radio