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I would recommend Harper Porsche in Knoxville. No affiliation. I have purchased and serviced a few cars - Audi and Porsche through them. Always a good experience.
I personally would trust Harper to do this. Outside of that, I would go to European Auto Garage http://europeanautogarage.com/
I know people who take their cars their and they all recommend them.
Sorry to bump an old thread, but this one covers my current need. Looking for a PPI in Knoxville , but the car I question is at Harper. Any other suggestions for a good 997 shop in the area?
sorry, didn’t realize this was the 991 forum. I found this thread via a google search.