MY09 STI. I have a really annoying high pitched screeching sound coming from the rear of the car at low RPMs. It seems to follow the exhaust tone roughly. I've checked the exhaust itself and the hangers are all fine and the clamps are all nice and tight so its not that.

Above the exhaust backbox is this piece of metal, a heat shield I assume? Its rusted away at the bolts and is loose. Could this be the culprit? I can't find anything else loose back there.

Video here: https://streamable.com/ve6pq7

In the video, I'm just under the rear bumper facing upwards, just behind the exhaust tips

 

Heat shield
http://opposedforces.com/parts/impre...llustration_2/

Do your rear pads have wear indicators??

 

Cheers, rear exhaust cover then. Hopefully it's that causing the horrible noise.

 

It's not clear if this noise happens when moving, or just at low rpm static, in gear, or coasting? The video just shows the broken shield.