Thanks J for the tip I now have one also
I am thinking about how to attach it to the the aluminium casting
What I do not want to do is fit the pipe inside the casting that way is a loose exhaust as the alloy expands
I think a simple turned adaptor in aluminium fitting inside both casting (opened up somwhat) and into pipe would be the best
but of course that all is on hold till Howeth silencers come into view over the horizon……..