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Mishimoto Aluminum Coolant Overflow Tank – 08-21 WRX/STI


Mishimoto Aluminum Coolant Overflow Tank – 08-21 WRX/STI


  • Direct fit for the 2008-2021 Subaru WRX and STI
  • Installs in under 30 minutes
  • All-aluminum, fully welded construction for maximum durability during repeated cold and hot transitions
  • Dipstick allows for proper cold coolant levels



Authorized Dealer


Get that plastic blob of an overflow tank out of your engine bay. 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. Mishimoto’s 2008+ STI / WRX coolant overflow tank is constructed from durable, TIG-welded aluminum for optimal durability and longevity. Included with this STI / WRX coolant overflow tank is a CNC-machined dipstick to allow for easy checking of coolant levels. With the choice of two finishes, polished and anodized black, this tank will have no problem matching the style of your engine bay. This STI / WRX coolant overflow tank fits perfectly with the stock or Mishimoto’s STI / WRX radiators. As with all Mishimoto’s STI and WRX parts, this overflow tank includes the Mishimoto Lifetime Warranty.


  • (1) Aluminum Expansion Tank
  • (1) CNC-Machined Dipstick
  • (1) Mishimoto Oil Fill Cap
  • Mishimoto Lifetime Warranty

Please Note

After a few hot and cold cycles, Mishimoto recommends checking the dipstick on the expansion tank to confirm proper coolant level.

Additional Information

Weight 6.1 lbs
Dimensions 16.4 × 16.3 × 12.6 in

Polished, Anodized Black


  • 2008-2021 WRX/STI