Some years ago there was a thread dealing with fitting a steel pipe to the alloy exhaust.
I have one of the Club alloy exhausts castings and I want to fit a 1.75″ pipe between it and my silencer.
I have considered machining the casting to take a 2″ pipe and the waisting down to the 1.75″ pipe but there is not much straight length on the casting to get a good hold considering that I need to a split for the clamp ring to work.
On my 1930 Dougals S6 the pipes fitted onto tappered stubs (a few degrees) and were held in place by a bolt from the pipes to the engine sump. A small amount of gum gum and it was fine.
Any one any views on whether I would be as successful turning a shallow taper on the casting, belling the 1.75″ pipe to the same taper and using a bracket to the frame to the pipe to hold it in place? A little gum gum might be needed