John, here in Raleigh, NC. PM'd you earlier in the week about Russ (shiraz) here in Raleigh who has an OEM muffler from his '92. You mentioned in your e-mail response to me that you need it this weekend, and can't wait for a shipment.
Thinking, if nothing turns up in DC area, maybe Russ would be willing to meet you half way. Can't guarantee it, but think about it. Somewhere near Richmond on I-95 perhaps. If considering this, I sent you Russ' cell phone # in my original e-mail to you.
Good Luck.