It's a 2011 Boss Mustang on a chassis dyno. To quote his caption, "This is hooked to a dyno...they run it up to 120, second gear chirp and all...that's how to sell cars!" So true!
It reminded me of the LS V8 on a dyno that GM had a couple years ago. That thing's muted sound carried all through the IX center. Imagine how cool this would be!
-Dave