Ever since I upgraded my exhaust I have been hearing this clunky noise. It’s not like a noise where something is loose, but almost a low clunky popping sound. The only thing I can use to describe it is how some cars sound when you have been driving and you park and cut the engine. That kind of hissing “popping” sound. Very weird. Anyone experience this? It’s way to low and quiet to get go come up on a recording.