I have enjoyed an amazing relationship with Tony Callas of Callas-Rennsport over the last 22 years, during which time he handled all maintenance and engine upgrades my 1986 911 Turbo exclusively. Before that (after new car warranty expired), the car was cared for by Edelweiss, where Tony worked until setting off on his own and establishing Callas Rennsport. Tony has established himself among the elite of Porsche mechanics and from time-to-time works with the Porsche Racing Team. His associate, Tom Prine, is incredibly knowledgeable about everything Porsche and willingly shares his wisdom. The repair and maintenance technicians I have had the pleasure of dealing with are, in my opinion, top-notch. They treat your car as of it were theirs. I wish I could give them 6 stars.