I was the victim of the same rattling noise and you have no idea how annoying it becomes :P. Just got the pins made 2 weeks and its working like a charm now. Feels like i am driving a different car altogether. Like Ahmed mentioned, the best way to check and diagnose the rattle is to press the paddle and see if the noise goes away.
Also, i am not sure its pyscological or what but i think for the past week or so i am feeling the car to be bit sluggish. My brother removed the CAT when i got the car and the rest of the items are fine too. Plugs are fine, Air filter changed last week, Throttle body cleaned last month, fuel filter changed 4 months but I am not sure what it could be or maybe like i mentioned its pyschological :P. However, the mileage is fine and got 23.14 in the last refill.