The exhaust on my 9-3 gets very loud when I shift from 1st to 2nd or 2nd to 3rd. It stays loud until the engine revs higher and then it goes away. The sound comes from either the engine bay or somewhere directly underneath it. Is this normal? The exhaust sounds fine under any other conditions. The car has only 21,000 miles on the ODO. If I shift without as much pressure on the accelerator it doesn't do it -- or at least not as badly anyway.