Same type of Remus silencer has just been fitted to my bike. Although the baffle is being kept in the garage for safekeeping. Sounds nicer without the baffle...
I believe so. Mine was fitted as part of a service. There is an allen screw to remove, although I understand some people report they have had to get the exhaust warm to extract the baffle. Try it cold first?
If you found the right bike, I've got a race fit exhaust with both baffle and GP style end for sale. It's the only exhaust I've ever bought that came with a free set of earplugs! Looked good on the bike and only rationalisation (until she finds out about the Panigale FE) meant that the Diavel went.