After I got my 83 944, I discovered that the timing belts needed regular maintenance with a special Porsche tool that cost $400+. Obviously I didn't want to go buy it, but the local (well, in Springfield, but the closest one anyway) Porsche dealership wanted $650 to do the job. Then a friend told me about Rick's Automotive. They do all kinds of imports--when I went there, there were 3 Porsches, a Jag, a couple Mercedes and a couple BMWs. They were able to do my timing belts for less than half of what the Porsche dealership was asking.