Mine have been perfect, but they sent me the right-angle extended bungs when I bought them (I was the first on this site, I think). You're just throwing a code from the O2 sensor as DJ noted. Nissan techs don't know what they're talking about. And a burnt out cat is just a test pipe as long as the cat core isn't blocking the exhaust outlet.
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2013 Cadillac V-Wagon, RIP Z
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