Sorry Mike but thats a Pitts muffler and my Moki is a great engine. I had a chance to go to a Bud Nosen P47 but I'll stay with the glow engines 85 inch wing span is big enough for me.Don't like the smell of gasoline.
I still have a WM P51 that[46 size] I am rebuilding for my Grandson and I think its a great model to fly.If the WMGS is as good,
I would not be surprised. Tom