Cobb Tuning Coolant Overflow Tank - Subaru WRX VA/STI VAB 15-17The OEM Coolant Overflow Tank for the 2015 2017 WRX STI does it's job well enough but the cheap plastic material is ugly and will potentially crack over time, especially when driving hard and going through extreme heat cycles. It's shape is also clumsy and obtrusive when adding an aftermarket FMIC. The upgraded COBB Subaru Coolant Overflow Tank solves these problems without any sacrifices. Constructed of welded aluminum with the same 1L capacity of