Interesting - have not seen one like that before.
Only questionable thing would be the added weight of the second muffler, but certainly looks nice
I wonder who produced the mid-pipe?
Wish they'd had better pics of the system on the bike though.
It's nothing you couldn't probably have manufactured by a decent fabricator whodkne - and use with whatever mufflers of your choosing would be. Probably end up cheaper than the UK cost plus shipping.