It's got about 10,000 miles on it. It's complete from the midpipe back. If you just want the catback that's fine too. I also have the stock manifold with about 8,000 miles (precat still good) but the threads on the o2 bung are stripped. If you know how to rethread them it should be fine. If you don't have an SE-R you're still able to replace the stock exhaust on your 1.8/2.0 B15 Sentra. Won't gain you much, but it's a little bigger piping... Or if you just want to go back to stock and sell your SE-R... Everything $150, Catback $75.