I have a pretty much disturbing noise from the back of the car ( outside). It is an high frequency noise when I decelerate, it is not there when the car is cold, and not there when I drive it more like it is supposed to be on the paper. The heat shield of the exhaust has an hole on the side, behind the side, I assume it can come from there isn't it ?
If you reckon that yes it is, can I take it off and maybe simply use the heat shield tape around the exhaust tube ? And first, drive a while without the heat shield ?