Automotive Techniques is right in Farmington hills. Jeff Jones runs the place; he was over at the Porsche Dealer in Farmington, then opened up his own shop about 20 years ago. He really knows the 944/968 series cars very well. If it's a local car and the owner was in the PCA, chances are he's serviced it. (You may not even need the PPI if he knows the car; he'll be honest with you)
One catch is that he's due to move the shop a couple miles up the road sometime this month, I'm not sure what his schedule is like right now. I need to get my car to for an allignment after installing the new suspension.
company info is at www dot automotivetechniques dot net