Hope this video works...
2007 Ford Mustang 4.6L 87k miles, solid maintenance since I purchased 2 years and 32k miles ago. When cold I get the noise in the video, it is definetly in the lower part of the engine, it almost sounds like it is coming from the transmission. Car runs smooth and strong, I hope this is an exhaust leak (fairly common on these engines). Open to all opinions.