I guess it depends what you want to do with the car as well.
If you keep the rest of the exhaust standard it’s probably loud but acceptable but if you change the manifold and mid pipe it will probably make your and everyone else’s ears bleed.
There are always plenty of Cobras on eBay for resale that should probably tell you something.
There are subtler options but it’s a very individual choice just be aware of the pitfalls.
After much research and dithering I’ve just bought a BBR GT back box for my NC. Not cheap but then nothing good ever was I suppose.
Cobalt are well regarded but out of production on the NC.
I started this thread a few months back, there’s a fair bit of info on exhausts towards the end👍