ORIGINAL: broke_n_bummin
here's a couple of pics. i almost know I'm not going to find an OEM muffler, but I should be able to find something that will work.
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I thought that this would be easy with some pictures, but I'm just as stumped as you are.
There appears to be no provision for fastening a baffle plate or exhaust rotor drum for throttling, so, it probably relied upon a strap-on muffler.
I'm with you in that I know you can find something muffler-wise for it. I bought a Tatone/J'Tec exhaust muffler/manifold (strap-on from Tower) for my ST G20/15 a year or two ago, so I know that something exists to get you flying legally at the club field.
Ed Cregger