The Mishimoto Aluminum Coolant Expansion Tank is a direct-fit upgrade for the Subaru WRX (2002–2007) and WRX STI (2004–2016), replacing the stock plastic tank that can become failure-prone after years of heat cycling. Built from 100% TIG-welded aluminum with barbed fittings, it adds durability while cleaning up the engine bay with a polished silver or anodized black finish.

Capacity is increased by 50% over the stock expansion tank, and the design is matched to the Mishimoto Subaru WRX/STI Performance Aluminum Radiator.

Fitment

• Subaru WRX: 2002–2007
• Subaru WRX STI: 2004–2016

Key Features

• 100% aluminum, fully welded construction
• TIG-welded aluminum with barbed fittings
• 50% greater capacity than the stock plastic expansion tank
• Finish options: polished silver or anodized black
• Mishimoto Lifetime Warranty

Specifications

• Overall height: 3.86 in
• Overall width: 6.25 in
• Capacity: 776 cc