After sending the audio clips to the shop, the Porsche tech and the shop foreman believe it's safe to drive. They say that it sounds like either the cats have come apart internally or more likely a weld on the exhaust heat shield has broken loose (since they had the tranny removed to do the IMS and clutch). I fear the worst - that it is the cats - which will be another grand to fix! While I guess I can't blame the shop, it seems like a strange coincidence they happen to give out the day I pick the car up from having all this work done.
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