If you buy one it may as well be stainless as the price difference is worth the long life, if its not your daily drive then you are more likely to get condensation in the internal of the exhaust box and tend to rot so stainless is a good call, I have a stainless from ebay, its been on 10 years or so without issue, they are pretty much a copy of the oem box but in stainless, slightly more noise but much lower tone so more rumble, not annoying to anyone, the fit can be a little tricky, be prepared to bend the brackets slightly but otherwise they are fine well mine was.
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Hi and welcome to the forum
I have a Toyo that I got cheap from them as a second due to one of the brackets being wrong so I adapted the way I fitted it.
Good luck with your search.
James
Let us know what it's like when you get it fitted. Pics are compulsory, lol!