We needed some R/RSR and ST/RSR Rally mufflers for some project cars that are running SSIs/heat exchangers (require heat) and after pouring over period photos we decided to convert some Dansk SS mufflers to make what we need.
We’ve done a small run of perforated inner, double walled stainless 70mm exhaust tips, blockoff caps, and created our own fixture to install them at the correct upward angle and spacing of the original part:
Still researching the correct flat grey coating for these, so if you have any insight there, please let us know!