After installing over the weekend, I'm absolutely in love with the Akrapovic. Its sound is so unique. I love that I can go to complete stealth mode with valves closed and engine in Comfort.
Opening the valves and selecting Sport+... wow. It's difficult to describe, and the YouTube videos don't do it any justice. The best three words I could use to describe the sound-- hollow, dry, and exotic. There's now a hard pop during upshifts at WOT
When I have some time I'll try to take some pictures and video.