This post is great
 

https://www.truckforums.com/m_12695/tm.htm

I've been searching for a noise in a 4.3L and ran across this post.

It starts out with a good question which gets a couple of helpful suggestions, then almost instantly goes to:

"No repair needed....get a louder exhaust"

Then proceeds to:

"Which exhaust is best?"

I'm sorry if I offend anyone involved in the post, but it just made me laugh.