I chased them up and got a really helpful Lady called Carol who I have been passing more photos to. On closer inspection it looks like there is already a DB Killer in there already. However she also thinks this is the wrong exhaust for my Beverly 350 and she thinks its too short. She took the model numbers of the metal ring which are SGI e13 0429 0430
She thinks though that there should also be a further DB Killer like a disk in the inlet where the can is attached. This is what she wrote to me in an email. "I’ve attached the schematic I was talking about showing the additional db killer that fits between the connecting pipe and the inlet of the silencer (NO.57). It’s available for £17.50 plus delivery. Alternatively there is a ‘disc’ that I can send in the post. Either would probably mean that the bike may run differently, and the length of your silencer cold determine which is best. Take your silencer length measurement from rivet band to rivet band, and also check the the inlet on your silencer is 50mm if you want to go any further."
Couple more pics and the schematic. Now Im really confused. I wonder if I would be better just sourcing an original exhaust.


This is the schematic but I think its for a different exhaust. Not sure which is the inlet DB Killer
