A sheet metal shop is where I would start. They can measure, perforate the inner tubes and form the outer shell. It shouldn't cost more than finding a stock one. Do you know the length you will need?
Restoration Supply in Escondido had these in their catalog a few years ago, but not in stock. Maybe different now. Buyer had to drill all the holes as I recall.
Johnny, check with Scott Henningsen, who has been reproducing take-apart mufflers for 1910s Pierces. Even if not identical, his sources for materials may be worthwhile to you.
Thank you.
jc
You could try a truck muffler catalog. It's possible to find a muffler that has the same or similar dimensions.
https://www.walkerexhaust.com/products/commercial-vehicle/commercial-catalog.html
You might try a model T Ford supply house for reproduction ends and build the length you want.
I have a NAPA muffler catalog that list their mufflers by dimension. You could probably find this on line.
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