For an 02 WRB Wagon.

Wagon has a lot already done to it.

Engine:
-IHI turbine. Not sure of size, but not too much larger than stock housings.
-Turbo back exhaust, ending in a Borla two tip muffler.

Suspension:
-Eibach springs (red in color)
-Full adjustable Coilovers (red in color)
-Rear sway bar
-Rear strut tower bar

Brakes:
-Subaru 4 Pot Calipers

Interior:
-EGT Guage
-Stock boost gauge
-Blitz DC FATT

Exterior:
-Black housed headlights
-Pink "i" Emblem
-Gold 10 spoke rims

Now. One question I have is.

I am getting an almost constant sound that is like metallic brakes. This sound is at a slow roll and not when depressing brakes. Sounds like coming from rear.

I know different types of Nissan Differentials have different sounds and was wondering if Subaru Diffs also had similar characteristics?

This car seems well taken care of. Does not feel abused, so wondering if anyone has any advice.

With all that I have been able to identify having been done to this car, I really wish I had some way to contact the previous owner to find out all the details.