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if you have an exhaust leak you should be able to see it by inspecting all the gasket locations with a flashlight, all around the ports / joints. You will see black soot. You have to really look for it, not just half ass it. I suspect the shops you had look at it may have just glanced at it or put it on the lift and ran it at idle.
Leak or hitting are most likely as others have said.
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