There seems to be a fair amount of unsupported weight from the fishtails after the can. I wonder if this and maybe mechanical resonance stresses the welds. Although it would involve major surgery thoughts were to reduce the length of the fishtail supporting pipes to minimise stress on welds as a longer term solution [Linked Image]

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone