Hi mate
I have the yoshi carbon fitted to my bike it was bought from performance parts by pyramid plastics as part of the deal for loaning my bike over the winter,there's loads on eBay I think they have to be shipped over from the states,I don't know of any UK stockist at the moment.
You wouldn't be disappointed with sound its superb TIP (fit it baffle in first and try it as It's awkward to fit after installation)
Here's a vid I made and this is baffle in don't forget and its plenty loud enough. https://youtu.be/atW0hD1thqk
Ended up going with Calsport - Power Parts - Accessories - Spares mainly because the price was good. The service was excellent, really friendly and helpful. Exhaust arrived the next day.
It looks pretty nice, but sounds beautiful, couldn't be happier.