It's pre '92 so you can get away without a cat. Be aware it'll get a bit noiser if you do, and you may lose a bit more mid range grunt whilst gaining a bit at the top end.
A friend recently bought a '89 1.8 Roadster in the same colour and I've gotta admit I'm getting a real soft spot for them. I'd love one as a little project car but they're still a little on the expensive side for that just yet.