Sooooo, I was one of the "lucky" people to experience the pinging and other abnormalies involving the exhaust. Well, car went in this morning, problem solved. Service manager just called me to say, "insulator replaced, computer flashed, this car runs stronger than ANY 2.0 on our lot" Great, I'll have to wait til tomorrow to see for myself. *crosses fingers*. There's a TSB (according to dealer) for moaning or pinging sounds during acceleration of 25 miles per hr and above, and after car engine is shut off. Called for replacing the "insulator/resonator".