My car has some rattles too. There used to be a rattle behind my cd player when I would floor the car. I took my cd player out and taped up all of my wires and torqued down all screws and bolts in site.

Rattles start when you keep taking apart your car and puting it back together. Also starts when you get a sub system or put on an exhaust. I can hear a lot of the rattles in my trunk because I took out my spare tire, spare tire lid, and the trunk lid.

To stop the road noise and rattles do what I said, tighten bolts and screws, add foam or other sound deadening to your body of the car and inside panels.