The last time that I checked or paid attention, the Bisson Pitts mufflers (side mounted engine, straight down dump) were considered the best of the choices you listed. That was several years ago. I doubt that anything has changed significantly since then.

I have Bisson Pitts mufflers for my Thunder Tiger 1.20, Super Tigre 1.40 (G2300) and my OS 1.60FX's. All work flawlessly with no failures or problems, such as poor muffler pressure force.


Ed Cregger