I was just surfing the E90 post when i came upon this thread
http://www.e90post.com/forums/showthread.php?t=67696.
The guy in the thread visited Eisenmann and had a tour in which he saw an exhaust system being developed for the new M3.
Could it be possible that BMW let BMW tuners get a hold of a test mule or provided them with info and documents on the car to develop their products on?
If this is true than we can expect mods soon after launch of M3.:rocks: