Any performance gains will be minimal, so if that's what you're after then no, it isn't really worth it. They can sound quite good with a nice exhaust on them though, so if that's what you're after I would recommend getting a 2.25 or 2.5" system from the cat converter back with a resonator and a decent muffler.
I have a fujitsubo muffler on mine which sounds nice but isn't very loud. If you want it to be reasonably loud then any cannon or straight through muffler should do the trick.