Glad everything worked out and nice score. It looks mint! I think you'll love it once you start using it.
Unfortunately the muffler itself is one piece. The front does not come off / split in two like a Sthil. You have to pull the whole thing out to...
I have a 555 for firewood, you may want to remove the chain brake guard as well to pull the muffler. Makes it easier just a heads up.