I'm very confused by that sale thread. It was a Greddy exhaust that was on a 2000 Accord, but was on an STi? There's no way the original Greddy piping could have been used. They must have cut and welded that thing onto the Accord.
You're paying $120 for a hacked up muffler. Save up another $200 for the real deal because you'll get the entire catback piping. With a custom cut and weld job, you're looking at another $200 or so. (2 hours of labor and needed material)