This R80ST came with no right exhaust header or collector box. I decided to replace the entire exhaust system as the rear muffler and left header had a fair amount of rust.
Here is the new exhaust system installed. I’ll install the muffler heat shield when I get the side panels back from the painter.
This is a link to the documentation and a short YouTube video summary of how I do this work.
VIDEO: 1983 BMW R80ST Install Exhaust System