I use a custom version of the Danmoto Jisu on the FZ6R, I did a little few FZ8 mid ship exhaust too. The first few FZ09 I try to use the same slip-on and S shape mid pipe but it wasn't a big success. I went with the Delkevic DS-70 instead, much better. You can get it in carbon fiber or stainless steel. Comes with a nice DBK, but I don't use it. I put a video too on the main page. Cruising speed sound is barely louder than wind noise. Double digit RPM is a different story but not annoying loud.
Many threads here on this topic, search around and youll find all of the data that you seek. I had the arrow full system and loved it...I thought it sounded just a bit better than the akra...but the Akra is more tucked in (my Arrow stuck out more than I would prefer).
This is what Indy told me when I contacted them
"Only the Ti currently we are hoping to see carbon at 1st week of august
but are told if that is not the date they arrive it will be mid Sept due
to factory shut down in Aug"