Originally Posted by The J-Man
If they are deleted for cooling, it makes no sense that the convertible has them and the coupe does not.
I think it makes perfect sense. Out of the E90/91/92/93, the one that is realistically going to see the most real track use is the E92. You don't buy an E93 for real track work (maybe just for the hell of it, but definitely not for competitive track driving--the weight penalty alone wouldn't be worth it). Same with the sedan and wagon. And if they're trying to get more cooling to the brakes, the current design is plenty ample for street use. But at a track you can never have enough brake cooling. So I imagine it's a nod to those who would probably drive the E92 harder and faster than any of the other models.