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Originally Posted by sd_boxster
3000ish RPM is where our exhaust hits resonant frequency. If you have a loose heat shield or a catalytic converter that is starting to degrade, that's the RPM where you'll hear it rattling/pinging.
If you post up a sound clip, you might get some better guesses. Good luck!
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I have a 2001 boxster with 100,000 miles on it. I hear a rattling from the catalytic converter, I know, because I used a stethoscope to detect where the sound was coming from. Might be an oxygen sensor cap.