I absolutely love my drummer SS and it sounds great. I'm not sure if it will fit the xb9 as I have mine on a xb12r and an 1125r. I'm sure if you call Kevin or get ahold of him through Kdfab.com he would be more than happy to answer any questions you have. Another great option is the Dean Adams RT-1. I have no personal experience with these pipes but tons of guys on here do. You can always take a look at what Dean offers at http://ecommerce.deanadamsdesigns.com/index.php?cPath=22&osCsid=09533d37720603d531d2d627d4bd79da
Or even shoot him a PM. Dean is a forum sponsor and also always willing to answer any questions you have. Also the RT-1 is a dual out like your old muffler. Good luck with finding the one for you, hope this helped.
Here is a clip with both the drummer SS and Jardine RT-1 on my 2009 xb12. Unfortunately I don't have the Dean Adams pipe.
https://www.youtube.com/watch?v=FMMaY8Nrhfo