Randall:
I got a great contact from RUF Porsche. They told me to contact Oklahoma Foreign. The phone number is 405-799-0645 or 800-462-2446. The web site is
www.oklahomaforeign.com. They are a specialty high-end junk yard.
They don't list your muffler on the web site, but I called, and they do have them. The price quoted over the phone was $200.
Give it a try.