Its got to be a ton of work cutting and rolling each section and then tacking and brazing.
How are the joints connected? It that brazing with acetylene/oxygen? 18 GA Steel?
No Rider, I had these pipes Sub Contracted, figured it was smarter to work with someone having materials, machinery and experience with knowledge on 2 stroke exhaust systems, I only came up with some drawings and ideals from listening to Mr Hall and Mr Shearers and even Mr R.K. from past threads.