I am new to Subaru and have try'd various search's to try and identify this unit but with little success.Can any one please tell me what this unit is called and what is its purpose, my xv has a rather annoying squeak when touching the throttle pedal very lightly on and off, I have traced the squeak to this unit on the exhaust pipe but before attempting to remove itto see if I can stop the squeak I would very much like some information on it.