I would highly recommend Steve Noe at Noe Imports.  We had our Audi towed to the dealership where they quoted us almost $8,000 for a new transmission that they claimed we needed.  We called Steve for a second opinion and he immediately recognized that the problem we were having was inconsistent with transmission problems.  We decided to tow the car from the dealer to Noe imports because we did not believe that they were correctly diagnosing the problem.  Sure enough, the problem was a $250 fix, not a new transmission.  I am so grateful for his expertise.