I have a 2013 WRX, got it in September.
I have noticed a rattling noise when I engine brake in 2nd gear. It doesn't seem to happen in any other gear. It sounds like it is coming from the exterior and not inside the cabin.
I already replaced my front license plate bracket as I thought that was it but I am still getting it.
I know Subarus are known for rattles but this doesn't sound quite right to me.