We've all seen pictures and video clips of the 1M's being equipped with Akrapovic's prototype exhaust. I recently spoke with my representative at Akrapovic and he gave me a little more insight of it's general public release.
Akrapovic has authorized it's dealers to start taking pre-orders!!!
http://www.1addicts.com/forums/showthread.php?t=557745
1. Full titanium system
2. Optional Downpipes
3. It will be valved with an optional wireless control for the valve system
4. Retail is set to be near the M3's Akrapovic Exhaust pricing
5. Late September 2011 release
Definitely sounds promising!
Borrowed this pic from Jason
Here's some sample Akrapovic exhaust clips: