I have a stock '06 WRX exhaust, resonator on back. It's the one on the left (bigger muffler) in this picture. Less than 16K miles on it, plus 3 years of dust accumulated in the shed. Make me an offer -- if you need me to deliver it to you, it most certainly won't be free with gas prices the way they are.
Best way to contact me is via email (kiirenza at g mail dot com).