This high quality alloy tank from Forge Motorsport will replace your upper radiator coolant tank. This is the tank that is bolted to your header in close proximity to your intake and turbo inlet. The factory tank is less-than-attractive and rather "chunky" which makes replacement something to consider. This is after-all the very tank that allows Subaru owners to dismiss the need for a turbo timer, so it might as well look nice and draw some attention as well! This piece is show quality and fits the 08+ GR Impreza STi. Pair with a high pressure radiator cap for the ultimate in coolant tank form and function!