Just an update.
I just received the J&A peacekeeper muffler for the bme 50 and will be installing it tomorrow. I also got a WT201B carb from Keith and will let you know how it goes in a few days. The big difference with this muffler is there is no baffle inside at all and it has the 3/4 in. output tubes. It's gonna be louder I imagine but as long as I get max power I'll be a happy as a pig in slop.