I've got a 3" Core!!
I had to replace my cat a while ago, and kept my old one for just this occaision. It's a Magnaflow 3" in/out, part number 94109, I got it from SouthEast Turbo. It isn't gutted yet, but could be easily. It's 13" long, has the mating flange for the exhaust, came off my CA GN, so it's never been in snow/salt. I've attached some pix. $45 shipped to your door via FedEx, and I can take PayPal at no extra. PM me if you're interested.
Sincerely,
John A, Turbohh