This was my second time using Griffin Motorwerke -- the first time was for racing harnesses in the front seats, and all went smoothly. This time I had racing seats installed and a minor engine problem fixed. If you read on you will see that it did not all go smoothly the second time, but Griffin handled the problem professionally and really went above and beyond. I would give them six stars if I could. Because I had to leave the car overnight and I live about an hour away, they were very flexible with me on scheduling. They were even nice enough to arrange for me to pick up the car on Saturday morning, when they are normally closed. When I picked up the car and started to drive home, an engine problem occurred and I had to turn around and take it back. Griffin immediately arranged a rental car for me which I drove home. On Monday when their technicians were back they discovered the source of the problem. I track my car regularly, and that's pretty hard on it. From what I understand it is likely that the problem had nothing to do with their work, and it was just a coincidence that it failed after their repair, but Griffin took full responsibility for fixing it at no charge. Not only did they take care of the problem, pay for the rental car, and drive my car back to me after it was repaired, but they did all of this cheerfully and never even suggested that the problem may not have been their fault. That is what is known as menschlichkeit. I spend tens of thousands of dollars every year on car maintenance and upgrades, and I have been to many shops in the Bay Area (from San José to Stockton). I have had good experiences at a few, but mixed experiences at most and some very bad experiences at others. Griffin is one of the few shops that I can recommend without hesitation. The only bad thing I can say about them is that they're too far from my house.