Does the noise go away when you depress the clutch pedal ? If you can get the car in the air take a tape measure or piece of wire or string and go around the heat shield on the cats. Take that length to HD or Lowes or local hardware store and get a SS band clamp of correct size. Tighten around heat shield/pipe if the rattle goes away you know what it is. Not suggesting that as a long term fix just for diagnosis.
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2002 Boxster S Arctic Silver with black top with glass window and black leather interior. Jake Raby 3.6 SS ( the beast ) with IMS Solution. 996 GT3 front bumper , GT3 rocker covers and GT3TEK rear diffuser and Joe Toth composites rear ducktail spoiler .
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