My suggestion would be to replace or repair the exhaust system as necessary.
I've done quite a bit of exhaust work myself, but then I don't hire out for
anything except tire mounting and glued-in windshield replacement. Anyway, when you do it yourself it can be quite affordable. On the latest one I did, I bought a section of pipe at O'Reilly's for $7 and a clamp for 90 cents and did the requisite cutting and fitting and that was that. For the Coupe I found a really nice all-welded, mandrel-bent system (probably factory) at a scrapyard; only problem was they'd torched the converter off. I was able to get a freebie short pipe section at a repair shop and I welded it to the front of that nice factory system for a total cost of "free". That was many years ago and the system is still good.
You may be able to find a complete system, or at least a muffler, for cheap online. I'd suggest looking at Rock Auto . com.