HELP!!!!! I have been hearing this anoying clinking/rattling sound coming from the catalic converter for the past 2 weeks.... Its weird cuss it only does it from 2000 to 3000 RPMs.... I was just wondering if cats can break on the inside or if they just go bad... I figure it can break considering its porsalin on the inside. But have any of yall had yours go bad??? Im at 100.000 miles so could it be cloging????? Thanks for any imput!!!!!!!!