I've put on two Magnaflow catalyitic converters. Stainless, so never had an issue with rust. One was on an OBD2 car, with a custom made exhaust, and never had any issues with the computer tripping a code for it, even years late. The other is on my Miata, which is OBD1 so it doesn't monitor the cat, but it put up with running a bit rich for ages without an issue, and it was a direct and easy bolt-on fit.
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