When you fit it you have to remove the metal heat shield from behind the footrest. Trial fit the carbon cover and make sure the exhaust outlet is in the centre of the hole in the carbon panel before nipping things up. If it is not central it will discolour the carbon or worse may crack it through vibration.
I ordered mine from Biohazard, infact we bought two as far as I remember we didn't pay any tax. Not loud, I use mine on my track bike, baffled it at Oulton was only 98 db.