Yes, that IS the Sound Symposer. Maybe I got too cheeky adding the "?" to my thread title. I thought people might wonder where it is, and what it looks like. This picture illustrates that.
As a matter of fact I took the picture on the same car that The Truth About Cars was driving. And, they were taking their photos at the same time I was.
In regards to sound, the Fiesta ST's Symposer is supposedly tuned to be a bit more raw than the Focus ST. Although, I'd have to drive them back-to-back to comment on that. When I drove the Focus ST last year, I thought it was louder than the Fiesta ST. The difference could be in the note or frequency though, 2.0 vs 1.6.