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I just flew from Baltimore in Sept and had PPI done at Rizza. I worked with Bob and he made the process very easy and his guys found out a lot about the car for me that I used in negotiations.
another vote for Al at CPT (www.gocpt.com). He has already worked on my 997 as well as a lot on my old Audi S4. I know a lot of enthusiasts that go to him.
I highly recommend avoiding the exchange. I've paid for half a dozen Porsche PPI's over the years, at the exchange I demanded my money back. They failed to note things that were clearly evident if anyone had actually looked at the car.