Yeah, anyone that makes an exhaust for the MP3 or Protege ES. They share the same chassis so that means all the exhaust systems are interchangable. The JIC SUS 505, I think they also make a titanium exhaust for the Protege. Bosal, Racing Beat full catback, and I can't remember the others. I all honesty, making a custom 2.5 or 2.75 exhaust and getting your own muffler will work fine. Just make sure you get a good muffler or you'll sound ricey.
