RE: Jett pipe?
I know it will on the Mag 52..... same muffler pattern.
Im not sure on the OS55.
Also, the OS55 engine is not set up for any real rpm use. Timing is very conservative - its a big prop, lower rpm engine.
Oddly enough, it is similar to the Jett BSE-76L and SJ-60L-H in those respects.
So the benifit of the .46 size jett muffler may be lost. But I guess anything is possible.