Did you by any chance rev up the car next to a wall to verify the tick is gone? Im wondering if I should get under and/or in there and check all the header bolts to see if they're tight. Seeing as they forgot to plug in the foglight harness from the factory it wouldn't surprise me if the headers are loose, missing a bolt or they forgot gaskets. I juts hope there isn't a crack. I'm ready to call Ford corporate and tell em this tick is ******** and needs to be resolved.