I had a 1981 911SC, setup for the driver's ed. This car was outstanding and ran like a top!! My clutch went up and instead of going to my usual mechanic (RPM) in VA (an hour away), I called TPC (15 minutes away) to see if they had experience with a 911SC clutch. They said they did. To make a LONG story short, I had it towed to their shop. That is important since I did not drive it, there was NO 'proof' of how it was running prior to them working on my car. When I picked the car up it was running BAD. The car was returned to TPC and I spent ANOTHER $1800.00 into tuning, BUT it still ran very bad. I had to take the car to RPM, who found that when they (TPC) dropped the engine they did not disconnect one electronic cable and damaged the connector. RPM repaired the connector, provided a written description of the damaged connector. Using this information and my persistance (4 months) I was able to get a refund for the NEW parts installed during tune-up attempt.