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Everyday is a school day, thanks guys.

...which is why there is a clamp band over it.. Thanks Steve. Should have found a photo of a muffler first.

One more question on the cabin heat box if I may. Is it a mixer or just a flap....

Hello folks, potentially naïve question, is the muffler shroud on a PA-18 segregated into two compartments or could back fires potentially blow into the cockpit if the carb heat were on and cabin...