Ernie,
This is most likely over kill but every time I drive my car for any length of time or hard after it has cooled down I have always checked the exhaust and header bolts and all others. And I have found some of them once in a while that had started to work loose just a little but by catching them quickly I have never had a problem. Of course with the cost of gas here I can't run any car long enough to create any exhaust fumes.
Ron
