Hullo Mark,
It was quite loud; between the OE Akrapovic and the MTC single silencer loud.
I made another silencer for a friend's F800GS, and a modified link pipe for him.
My OE Akrapovics are wearing out; I had to repair the 2-1 pipe the other day, so I will likely make a new single link pipe up in the new year for another silencer. I want to take it either under the seat and use a CBR600RR silencer with the plate and light below, or a single pipe up the RHS and use an off the shelf Supertrapp.