I have just noticed that a tower muffler for .46 and a regular muffler for .91FX have interchangeable parts. One can use the end part of .91FX muffler with .46 Tower muffler. So you will have a bigger muffler (nearly a .91FX muffler's wolume ) with the correct spacing between the bolts to use with .46 - .53 engines. I think the diameters are matching.

So what. Will this new muffler give us some more power ( or will swing bigger props. ) rpms. etc.

Maybe someone will care to try.

Best regards.

Zafer Türkeli