Making progress. The dealer pinpointed the rear noise to the metal shelf the speakers are mounted in. The shelf is rubbing against the c pillar wall. One of the welds holding it in place is broken. The dealer is going to re-weld it on Monday. Hope this takes care of it.
Good to know. Thanks for sharing that. I have a rattle but I'm not sure if it's from the exhaust (muffler hanger had to be heated and bent) because I'm thinking it wasn't there until I had the exhaust adjusted.