Another great upgrade from Mishimoto would be a solid aluminum overflow/expansion tank. The stock plastic tanks are prone to failure due to repeated hot and cold cycles and they create a horrible eyesore as they lurk in your engine bay. The Mishimoto 2013+ BRZ/FR-S/GT86 coolant overflow tank will replace your stock plastic tank and prevent damage down the road.
This coolant overflow tank is constructed from durable, TIG-welded aluminum for optimal aesthetics and longevity. Included with this 2013+ BRZ/FR-S/GT86 coolant overflow tank is a sight glass for easily checking coolant levels. With the choice of two finishes, polished or anodized black, this tank has no problem matching the style of your engine bay. This coolant overflow tank fits perfectly with the stock or Mishimoto aluminum radiator. As with all Mishimoto parts, this overflow tank includes their Lifetime Warranty.