Hey there Nick... I know you've read my thread already, but I too hear a trumpet like noise, but to me, it doesn't seem as if it's coming from the tires.

I notice it mostly when I haven't been driving the car for a long time yet... I hear it when the RPM's are climbing, but there are times I hear it too as I'm driving at a constant speed.

In my case, I hear it only from the driver front side. Does this sound familiar?