Originally Posted by Midnight Tech
Loose heat shield perhaps?
It's most probably this - according to Tom and Ray (LINK)
the rattle is the single most common complaint they get. My car's got it too. Does it happen as you're accelerating through a specific rpm? If so, then have someone look at the heat shield and either replace it, weld it or (maybe) remove it?
"nam qui dabat olim imperium, fasces, legiones, omnia, nunc se continet atque duas tantum res anxius optat, panem et circenses" Juvenal