Hey fasscort! Welcome to the site!
To see what can be done with a 4 door scort, go to the Car Showcase and check out the pics for Dreamland. He has a Tracer, but it´s the same body you have, assuming yours is a 4door with a trunk. IMHO that bodystyle has a LOT OF potential. Makes a great sleeper cause no one really expects a 4dr to be fast.
:-] The only body kit I´ve heard of for the scort is Erebuni, it fits the 3dr (2dr hatchback) only, and I´ve heard it´s not currently available. There is an EVO front bumper/air dam that should fit any scort, but I don´t think it´s still available either, but you might be able to find one. Check out 91Sleeper to see what this looks like. I think the Escort GT front and rear bumpers would fit your 4dr, but not the side skirts. Any of the Tracer parts would work too. There´s a one-piece spoiler that some of the 4drs came with, or just about any wing would work.
The only performance exhaust system that fits is the Pacesetter cat-back system. The other option is to have pipes custom-bent and fitted to the performance muffler of your choice.
Check out the Car Mod Journals to see what kind of mods others have done to their scorts. Also check out the Featured Rides at EscortPower for more ideas.
Hope this helps get you started!