I have a G21-46 and can't run it... the muffler that came with it was a flow-through and won't meet local noise standards. I know that I could get a strap-on, but I was wondering...

Did the G21 actually come with a closed-end muffler like you show with your G20-23? I wonder if the muffler that I got with this (used) engine is not the Original Equipment muffler?

Bob