hello friends i am new in the group i have a 2011 express 5.3 rwd and i need your valuable knowledge i have clunk noise when take off gas and put again and i want a recommendation from headers you can send the invoice to my email 😂😂😂😂😂😂

 

Clunk noise might be U joints, as far as headers go, I'd recommend taking it to a muffler/exhaust shop.

 

My 2013 Silverado had a clunk like yours and it turned out to be a bearing in the differential. I got lucky and it was repaired under my extended warranty. They even gave me a loaner.

 

had a clunk on coast. Slip yoke needed lube.