Hi,
I have this Saito Gas and it works fine for over 5 years now. However the muffler keeps breaking off and I decided not to replace it with another original muffler but buy a nice custom made
at Krumscheid Metallwaren.. I cannot post the link, check them out if you need custom mufflers.

However I am not sure what Thread the cylinder has.. it measures 14,4 mm, the exhaust pipe. I am not sure if this is a M14 x1 or M15 x 1 tread..
Any ideas?