Piper Warrior low rpm?

[Dan Thomas]

It appears that the at least the end plates on “ tubeless” mufflers is of a

heavier gauge as I seldom find cracks that were present with “ tube” type.

Perhaps the tubes were also intended to provide some structure?

The tubes put bending forces on those endplates and cracked them. The expansion of the tube lengthwise did it. I had less trouble with the tubeless mufflers.

Thanks for education on flame tubes. I am thinking they are like spark arresters so we don't catch dry fields on fire.

The big holes in those tubes won't stop any sparks smaller than a marble.