Im interested as Well. I woud like to cut the very end tail off as with aftermarket exhaust it just kinda flaps around. I would cut it as in "old" pic.
You don't have to cut the matt-black plastic around the tip of the exhaust. When you disassemble the "exhaust fairing" you can take out the matt-black plastic easy, so you don't mess with the original plastic when you want to put it back (for when you're gonna sale the bike or something).
/Edit: sorry I missunderstood your post. That 'flap thing' you're talking about is easy to remove with my dremel method