The Fiero Store sells cat kits for all Fieros for around $120. What you get is a long J-shaped piece of exhaust pipe and a new cat which is much smaller and lighter than the original.
To install it, you cut the old cat off at the downstream end and unbolt it from the head pipe at the upstream end. The Fiero Store's J-pipe is so long your could install it and run without a cat - or you can cut a section out that's shorter than the cat and bolt the cat on, which I did.
It would have worked great if the head pipe-to-exhaust pipe bolts hadn't broken off, so I had to drill them out, retap the holes, and install new bolts. Then I cut too much off the J-pipe and had to hillbilly-rig a patch from my leftover pipe. The patch leaked, so I ended up going to Tuffy and paying to have the whole thing welded anyway.
Exhaust work sucks.
