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The hardware stores the VIN numbers, not the software. You'd have to re-flash the hardware in order to wipe the VIN numbers.
As for buying cheap OBD-2 diags on eBay, a code reader is a little different than a datalogger, really. You get a LOT more info out of these set ups than with a simple code reader.
Also, a code reader wouldn't give you your ignition counts or anything else Porsche-specific. It would just give you what's available through OBD-2.
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