if you guys have have the gts,it depends on how loud the chatter is,there is nothing wrong with it.
i had the same concern about my motor and a friend of mine also,my tech man busted her open(my friend first though
adjusted shims check everything,and put her back up, guess what it helped just a little bit. we conlcuded that thats how thw 2zzge is! since then we compared several other cars and they are basically the same,a little noisy.depends on the gas too.