I've had them serviced at Autosport.
Rene is one of the most honorable and standup guy's I have ever meet in the 911 Porsche repair business.
Fair and honest, they inspected in the engine through and through to make sure it was sound and gave me the reasons why most importantly.
Peter Potzinger is a Master Porsche mechanic who has worked in all the largest Porsche shops in NY.
The service has been excellent and I have no complaints.