Phil,
Yes, copper metal that can be brazed and moulded pretty easy.
I used to make sheet metal fittings out of sheet copper all different
thicknesses and braze some pieces water tight. So I was thinking
of trying a copper tuned pipe? Was wondering if anyone had done
that at all? What gave me the idea was the twin engine straight
stack on the John Bridge engine.
Thanks For Reading Or Sharing Your Thoughts,
Mark Sholund