The OEM Porsche muffler and pipe is stainless and even in CT the rust should be minimal on a good used setup. I would try an autoparts wrecking yard or keep looking for a car being parted out. Shipping cost would be expensive. Another excellent place to get a setup is from George at
www.944ecology.com. He is a knowledgeable member and he is located in your close? area.
I have a stock setup on the '88 924S and a nice upgraded sound on the '87-I call it the "humble rumble"
GL
John_AZ
1988 924S + 1987 924S