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Air!!!!
Air in the lines might have caused this. Kinda makes sense to me. I was about a quart or two low on coolant. I did a spectacular launch on the e-way from 0 to 100 in what I think was about 3 seconds. Perhaps the coolant sloshed and sucked some air up in the line.
The thump I heard? Could have been an unrelated problem that I have not discovered yet. Or perhaps the belt slipped. (The sound did resemble the belt falling off). I replaced the pump and thermostat and will be flushing the system with distilled water before purging again and filling with proper Porsche coolant.
I'm feeling better thinking that the problem has been discovered. (I hope)
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