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Those cats are still there, in the same place and still having some issues on the qr25. It was not just the Sentra's but also the Altima's that had that issue. It uses cam phasing to create an egr effect, same theory behind the fa20 cam phasing. As the cat breaks down over time it cases the engine to ingest the material from the cat and causes cylinder damage. I think Nissan has upgraded the cat quality some sense there initial release.
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