Hi,
I recently bought a new 2014 MR and around 350 miles, I started to notice a weird noise in slow acceleration and also deceleration. It's more noticeable when cold. It also does it in park when I rev it just a little. I've searched, but couldn't find anything. Here is a short clip of what it sounds like.

http://youtu.be/Y5nheGMV_fs

Any help would be appreciated. Thanks