My mate fabricated joint pipe himself then installed HP Corse exhaust on his R3R as attached photo.
Since he didn't like its sound once he run the bike, he is considering extra modification right now.
He uninstalled the exhaust pipes and is modifying them right now.
I would be able to get some pictures then upload here when he finished the modification.
The mate has finished the exhaust pipe then installed.
He Added a motor valve to make less loud.
The motor valve allows to select two position i.e. fully open and a constant aperture. He set the constant aperture around 30% flow.
You can hear difference between them.
He also wrote Penner's map into ECU then rode. Seems to be satisfied with the performance.