The people on this forum seem to not understand the point of an M3. It's a sports car that can be adapted for track use, not a track car.
The CRT has creature comforts such as Nav and Stereo because it's still a daily driver car! Lightweight isn't even in the name! It's a car mainly to preview what Carbon Fiber technologies BMW is currently developing and how they can be implemented. The technology just happens to save 100 pounds in this specific application...