i looked under my car today and noticed that there is a chamber after the cats, but before the muffler. i would therefore assume that this is the resonator. as for the heat shields, which of these are the ones that tend to rattle? it looked like the exahaust tube was encased with shielding at points that 'sandwiched' it and then there also seemed to be a larder shield just above the muffler. when people talk of removing their heat shields, do they mean all of these or only a select few?
sorry for the long post, but that noise is driving me nuts.
toby