I know this is an old post but just wanted to let people know who are not familiar with shops in the area. Mike at G&M Automotive, has not been reliable in the past. Most of the Buick club here has disowned him. My personal experiences were 6 months turn around time was the quickest turn around. Bill has done most of the mechanical work on my car, but I don't think he does tuning. Some complain he is expensive, but I've done work with him for 20yrs & never had to bring the car back once, because he did something wrong. A side note, Bill don't accept credit cards.