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Originally Posted by Gent
I had noticed something similar on my 2000 Boxster with about 90,000 on it. I had it checked out, and the only thing wrong was that one or more baffles inside the rear cats was coming adrift.
It only shows up at a couple of rpm points under light throttle. I'm going to try a secondary cat delete and see if that addresses it. If I'm wrong, well, there really is no downside but I'll look at the exhaust afterwards.
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Let me know your results. That does make sense. My rattling cat is connected to the exhaust manifold.