Well, I did it, Those parts are interchangeable and the end part of an .91FX muffler fits like a glove to a .46 Tower Muff. Now I have to find fine weather to try. Ankara is windy today and We are expecting some snow for tomorrow.

My Irvine .53 with Tower muffler will turn a 10 x 7 (cut down to 9x7) prop about 15.5K with %5 nitro. We will see what it can do with a T.O.S. Muffler. I like to see something around 16-16.5 K. which will be closer to Jett. ( My second hand Jett does 17,5 with the same prop with %10 nitro. But I am having some problems with the idle.)

As you can see from the pictures * sorry about the poor focus * the new muffler is about the size of a Jett .60LX muffler. I wonder if it is as good.... . With the rest of the two I can still make a short muffler..[].

I will post the result.

Regards.

Zafer Turkeli