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I am loooking for a ... walker muffler.
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The Walker BTM #21470 is available lots of places.
If you want to support the vendors that support TheDieselStop, you can order it from http://www.blackclouddiesel.com/Ford/walkermuffler.htm
- note the install instructions require a tiny bit of welding. I had mine installed by a Midas Muffler shop, and they charged me about $35 a few years ago.
NAPA under NAPA part number 21470. They probably won't have it in stock, but they can order it.
Advance Auto Parts and other brands that are part of www.partsamerica.com
- again, they probably won't have it in stock, but they can order it. Or you can order it direct from www.partsamerica.com
- just search for 21470.
Lots of folks prefer www.summitracing.com
- search for part # 21470. Note they call it a "Dynomax" muffler, but Walker and Dynomax are two sides of the same Tenneco muffler operation.
Be sure to order the two 3.5" muffler clamps with the BTM. Ordinary auto parts stores don't have bigger than 3". I had to get mine from a big-truck parts store. Black Cloud Diesel shows them on the same webpage as the muffler.