G'day Bon Scott
I cannot find NOS or repros of this hush-tone design.
Yet, it was the one used on SB AUS-made Kirbies.
Perhaps it was a Kirby design?
In any case, there is a clear sound difference between these mufflers
in spec and when burnt out! I hate noisy engines!
You have offered a solution here, and I am sure this will help
members down the track.
Many thanks for giving back.
----------------------------
Jack