Quote Originally Posted by lilump View Post
yes that is it! I don't know what is wrong. Do you?

Muffler Bearings, I'd replace the whole cat-back system or grease the bearings j/k j/k

Mine did that too, i think it has to do with the line pressure or possibly maybe need a service, I got a tuned pcm that up'd the line pressure and did a service just prior to a filter fluid change, doesn't do it anymore... food for thought, good luck