Just brought it in with the knock to the dealership. Service Department tells me not to worry, it is due to being so cold outside (24*F). The knock is normal, so is the tick. I guess 2014 Ford Mustang Cyclone engines are supposed to sound like in my opinion an old tractor in cold weather. He did point out the same knock noise coming from the passenger side in the rear of the engine as well, but it wasn't as noticeable nor load as the driver side. I did notice the knock only happens after the engine has warmed up and it continues to make the same noise when revving but at a faster frequency of course.