I was looking at exhaust options a while ago. A couple of forum members recommended Imasaf steel exhaust systems. I bought one but have not fitted it yet. It looks very well made and the service from the company I bought it from (on eBay) was very good. If you type the word exhaust in the search box at the top of the forum page you'll see some previous comments on exhausts for Fulvias. Also, if you search "Fulvia Imasaf" on Ebay you'll see their offerings. I didn't find out the cost of stainless steel systems but I think they'd have been outside my budget.
Stainless systems are a lot more reasonable to buy these days,and are worth the cost.
I bought a secondhand system from the downpipe as far back as the back box from Omicron about 12 years ago, that is still going strong, and I changed the back box to SS about 5? years ago, although Omicron supplied this via their usual supplier the bracket was on the wrong side, and the tail pipe angle was way out, so I had to have it cut and shut.
however this had gradually got nosier and I'm not sure how much longer I can use this before having in cut apart and have the insides replaced, if you listen to "Fay" on the Video clips of her on the Kop Hill Climb, you'll hear that while the engine note is rather nice, it is a bit loud, and frankly out of keeping with the Berlina.
Brian
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