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What you should look for:
First the qualifications and reputation of the guy who is going to do the PPI. Ask to see a copy of one he has done. Look for detailed measurements of lots of things from tire tread depth to rotor thickness to the engine parameters listed above and more. Does he do a leakdown. Have a durametric/PWIS/PST2? How many Porsches are in his shop for big jobs. I like to see race engines on the prep stands.
Then is she comfortable in the car. Drive for at least 15 minutes.
The obvious cosmetics and functionality you can test, fiddle with, etc. The tires age.
Then let the PPI lead you.
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