It might be easier to remove both sides...remove both foot controls (brake and shifter), rear pegs, unbolt the header at the engine, i think there is a clamp at the cross over pipe that needs to come off too. Once you have all that off...everything should come right off. You may need to replace the copper gaskets.
1) Spray some penetrating oil onto the header nuts at the head, the clamp bolt on the header crossover pipe and the muffler clamp.
2) Beer break. Give the penetrating oil time to work in.
3) Gently loosen and remove the header nuts from the left side.
4) Remove left muffler.
5) Remove the header mount at the frame.
6) Loosen the clamp at the crossover, wriggle the disconnected pipe loose and remove.
7) Now is a good time to gently remove the header nuts from the right side, replace all four header nuts with stainless steel nuts and washers.
8) While the header gaskets can be heated red hot and "annealed", you could also just replace them.
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