i saw this video and love the way it sounds. any idea what the exhaust is.. i have browsed hundreds of slip ons and found nothing like it.

 

It looks self made. Akrapovic has few different type megaphone slip-ons for example to the R6R. And Leovince calls them cone silencers if i remember correct. They have a little bit similar look if that what you are looking. And allso there is Ajko if you are looking for sound You should check these manufacturers and you could ask the user that's has that video where is that mufler from?