I know this is kind of vague, but atleast If I could get some ideas what's causing it, then maybe I can find the problem. I noticed that when I accelerate, there is a rattling sound coming from the dashboard area. I first noticed it when I was at the track a month ago. While getting towards the end of the 1/4 mile and still accelerating in third gear, I noticed this rattling. It sounded like something was loose, kind of like the marble that shakes inside of a spray paint can. It went away and I couldn't get it to do it again until yesterday. Its not really loud, but enough if I have the radio off that I can hear it. Any ideas WTF is causing it? I am getting my catback system installed today, so If you can all point me in the right direction, I could have ford look at it. I am using the right octane (87) like the manual says, and my car is pretty much stock.