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sd_boxster · 10-21-2009, 03:24 PM

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!

10-21-2009, 03:24 PM	#12
sd_boxster Registered User Join Date: Oct 2008 Location: San Diego Posts: 434	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! __________________ 1999 Carrera 4 • Aero kit • 4" UD Pulley My Corvette doesn't leak oil... it sweats horsepower.