Exhaust leak found!
Well, I finally got the time today to track down my annoying exhaust leak. I was concerned that I might have a cracked exhaust manifold (THANKS HANS!!! :-( ). As it turns out, the manifold is not cracked. I have lost a nut from one of the 3 flange bolts between the curved part of the DP and the flex joint. That sucker vibrated right off. Should be a real easy fix (remove charge pipe, maybe strut brace, add new nut, tighten). The bad news is that it's a 13mm nut, and the only store I had time to check with today didn't have 13mm nuts. They had 12mm and 14mm, but no 13mm! WTH? Hopefully I can track some down tomorrow at another location. Anyhoo, the problem isn't nearly as bad as I was fearing.
PS. To those of you with 42DD dp's, check your nuts!